News

October 2021

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  Graduate Seminar: Visible light-emitting diodes for next-generation displays

  1 min read · Sun, Oct 3 2021

  News

  This talk will provide an overview of the III-nitride-based visible light-emitting diodes (LEDs). Especially, the InGaN-based blue LEDs are very contributed to energy-saving for light sources all over the world.

September 2021

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  Full color LEDs cut down to size

  1 min read · Sun, Sep 26 2021

  News

  communications LEDs electrical engineering materials science

  Tiny light-emitting devices that can create all the colors in the rainbow are essential for the next generation of phones and screens.
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  Investigation of a Separated Short-Wavelength Peak in InGaN Red Light-Emitting Diodes

  1 min read · Thu, Sep 9 2021

  News

  The paper reports the investigation of the electroluminescence properties of the additional peak in the EL spectrum of InGaN-based red LED structure. These results were helpful for understanding the EL performance of the red InGaN QWs and may be useful as guidelines to improve the quality of high-In-content QWs in the future.

August 2021

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  Meet KAUST new student: Jin Yu

  1 min read · Mon, Aug 30 2021

  News

  photovoltaics thermoelectric appliances

  Jin Yu is a physics graduate who joined KAUST in July 2021 from Nankai University (NKU), China. Before joining KAUST, Jin worked as an intern at Wake Forest University (WFU), North Carolina, U.S. After completing his studies at WFU, Jin served as a volunteer high school teacher at China Volunteer Association for almost a year.
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  Photoluminescence of InGaN-based red multiple quantum wells

  1 min read · Wed, Aug 25 2021

  News

  The paper reports the investigation of the optical properties of InGaN-based red LED structure with a blue pre-well by measuring the excitation energy and temperature dependent photoluminescence (PL) spectra. The deep localization of quasi-QD structures suppresses efficiently the escape of carriers and then enhances the emission in the red, which is the reason for strong emission intensity. The variation of internal quantum efficiency with excitation intensities indicates the better crystal quality of blue pre-well and the occurrence of defects in the red-emitting structures. The experimental results will provide a useful guidance to fabricate a longer wavelength InGaN-based optoelectronic devices with high-quantum efficiency.
• 

  Improved performance of InGaN-based red light-emitting diodes by micro-hole arrays

  1 min read · Mon, Aug 23 2021

  News

  The paper reports the luminescence improvement of InGaN-based red LEDs by introducing a micro-hole array. This technique provides the improvement of the internal quantum efficiency and light extraction efficiency. The InGaN-based red LEDs are very attractive for next-generation micro-LED display, because the material is a family of blue and green LEDs.
• 

  Paper accepted in Optics Letters!

  1 min read · Thu, Aug 19 2021

  News

  The paper reports the new device fabrication for the green micro-LEDs. The micro-LEDs have recently gathered considerable interest for next-generation display applications, such as smartphones and watches, augmented reality (AR), and virtual reality (VR) devices. ​
• 

  Top Cited Paper Award (Saudi Arabia) from IOP Publishing

  1 min read · Fri, Aug 13 2021

  News

  As one of the most cited articles from Saudi Arabia published across the entire IOP Publishing journal portfolio in 2020, using citations recorded in Web of Science “Demonstration of low forward voltage InGaN-based red LEDs” D. Iida, Z. Zhuang, P. Kirilenko, M. Velazquez-Rizo, and K. Ohkawa, Applied Physics Express 13, 031001 (2020).
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  Paper accepted in Japanese Journal of Applied Physics (Invited review)!

  1 min read · Mon, Aug 2 2021

  News

  In this paper, we review our recent progress on InGaN-based red LEDs, including the epitaxial structures and device fabrication. We also present the optical performance of InGaN red LEDs with different chip sizes from hundreds to tens of micrometers.

July 2021

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  630-nm red InGaN micro-light-emitting diodes (<20 μm × 20 μm) exceeding 1 mW/mm2 for full-color micro-displays

  1 min read · Tue, Jul 20 2021

  News

  The paper reports InGaN-based RGB micro-LED arrays that comprise every single µLED in the dimension of 17 × 17 µm2. We obtained the output power density of the InGaN-based red µLEDs as 1.76 mW/mm2, which was estimated to be higher than that of 20 × 20 µm2 AlInGaP red µLEDs (~630 nm). The result reveals a great potential for the InGaN materials to be used in full-color micro-displays.

June 2021

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  Paper accepted in Jurnal of Applied Physics!

  1 min read · Tue, Jun 29 2021

  News

  The paper reports an atomistic origin of composition pulling effect in all GaN-based ternary alloy was clarified from the the geometric configurations using first-principles calculations. We found that the most stable configuration involves two B, In, or Al atoms occupying Ga sites in wurtzite GaN along the c-axis which is the typical epitaxial growth direction.

May 2021

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  606-nm InGaN Amber Micro-Light-Emitting Diodes With an On-Wafer External Quantum Efficiency of 0.56%

  1 min read · Thu, May 13 2021

  News

  The paper reports the device performances of the amber micro-LEDs. The on-wafer external quantum efficiency was as high as 0.56%. The micro-LEDs have recently gathered considerable interest for next-generation display applications, such as smartphones and watches, augmented reality (AR), and virtual reality (VR) devices.
• 

  Making the shift from blue to red for better LEDs

  1 min read · Sun, May 9 2021

  News

  materials science semiconductors electrical engineering

  Pure red-light micrometer-scale emitting devices made from a nitride semiconductor reaches excellent efficiency.

March 2021

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  Graduate Seminar: Blue LED material beyond Blue for Micro-LED Displays Open configuration options

  1 min read · Tue, Mar 30 2021

  News

  Abstract Energy is an indispensable part of our lives. We are challenging energy-saving novel light emitters and clean-energy generation systems at Energy Conversion Devices and Materials (ECO Devices) Laboratory at KAUST. The former is based on MOCVD technology, material science, and device technology. The latter is the nitride photocatalyst invented by Ohkawa. The development of highly-efficient InGaN-based blue LEDs was the topic of the 2014 Nobel Prize in Physics. InGaN-based green LEDs were realized after improving the quality of higher-In-content InGaN. The three primary colors in light
• 

  Paper accepted in Optics Letters & Ranked in “Top Downloads” during April-June 2021!

  1 min read · Fri, Mar 12 2021

  News

  This paper has ranked in "Top Downloads".​ Congratulations!
• 

  Paper published in SPIE Conference Proceedings!

  1 min read · Fri, Mar 12 2021

  News

  The paper reports that phonon-exciton interaction properties in experimental PL spectrum analysis and theoretical calculation of population transfers of excitonic levels. Longitudinal optical (LO) phonon has strong electric interaction with particles and fields. Particularly, the interaction in III-nitrides is more significant than that in conventional III-V materials. We show phonon-exciton interaction properties in experimental PL spectrum analysis and theoretical calculation of population transfers of excitonic levels. Thermally nonequilibrium occupations of LO phonons and other

January 2021

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  Optics & Photonics News announced our phosphor-free white LEDs

  1 min read · Thu, Jan 7 2021

  News

  Optics & Photonics News is a general journal from The Optical Society (OSA) in USA. This journal announced our very white LEDs which demonstrate a high CRI value of 88 out of 100. The article is entitled “A Phosphor-Free White LED”. Link: https://www.osa-opn.org/home/newsroom/2021/january/a_phosphor-free_white_led/​​

December 2020

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  Elecrtonics Weekly announced our research result about tuneable Phosphor-free White LEDs

  1 min read · Wed, Dec 23 2020

  News

  ECO Devices Lab has developed unique White LEDs without phosphor by the original MOCVD technology. Nitride-based LED quantum structure emits white light that covers 410-770 nm. The LED light covers over 90% of the human visible region. The article entitled “Optoelectronic devices that emit warm and cool white light”. ​ Link: https://www.electronicsweekly.com/news/research-news/tuneable-white-emitting-led-needs-no-phosphor-2020-12/​
• 

  AZoOptics announced our research result about new approach to fabricate white-light LEDs

  1 min read · Tue, Dec 22 2020

  News

  ​ECO Devices Lab has developed unique White LEDs without phosphor by the original MOCVD technology. Nitride-based LED quantum structure emits white light that covers 410-770 nm. The LED light covers over 90% of the human visible region. The article entitled “KAUST Researchers Develop New Approach to Fabricate White-Light LEDs​”. ​ Link: https://www.azooptics.com/News.aspx?newsID=26496​
• 

  KAUST Discovery features "Optoelectronic devices that emit warm and cool white light"

  1 min read · Mon, Dec 21 2020

  News

  material science electrical engineering

  A single semiconducting material can produce white light by emitting light across the visible spectrum.
• 

  ScienMag announced our research result about Phosphor-free White LEDs

  1 min read · Mon, Dec 21 2020

  News

  ECO Devices Lab has developed unique White LEDs without phosphor by the original MOCVD technology. Nitride-based LED quantum structure emits white light that covers 410-770 nm. The LED light covers over 90% of the human visible region. The article entitled “Optoelectronic devices that emit warm and cool white light”. ​ Link: https://scienmag.com/optoelectronic-devices-that-emit-warm-and-cool-white-light/​
• 

  Phys.org announced our phosphor-free white LEDs

  1 min read · Mon, Dec 21 2020

  News

  ​ECO Devices Lab has developed unique White LEDs without phosphor by the original MOCVD technology. Nitride-based LED quantum structure emits white light that covers 410-770 nm. The LED light covers over 90% of the human visible region. The article entitled “Optoelectronic devices that emit warm and cool white light”. ​ Link: https://phys.org/news/2020-12-optoelectronic-devices-emit-cool-white.html​
• 

  EurekAlert! announced our research result about Phosphor-free White LEDs

  1 min read · Mon, Dec 21 2020

  News

  ​ECO Devices Lab has developed unique White LEDs without phosphor by the original MOCVD technology. Nitride-based LED quantum structure emits white light that covers 410-770 nm. The LED light covers over 90% of the human visible region. The article entitled “Optoelectronic devices that emit warm and cool white light”. ​ Link: https://www.eurekalert.org/pub_releases/2020-12/kauo-odt122120.php
• 

  KAUST Discovery published an article about our research on red LEDs

  1 min read · Sun, Dec 20 2020

  News

  ​Red LEDs created by ECO Devices Lab show excellent performance. A key technology at KAUST is an original metalorganic vapor-phase epitaxy (MOVPE) technology.​ KAUST Discovery Issue 10 (August 31, 2020) / Fall semester 2020. p. 32-33 Link: https://discovery.kaust.edu.sa/magazine/pdf/5f9151e2e495741e2c784355​
• 

  Prof. Ohkawa delivered an invited talk at CVD Society of Japan

  1 min read · Fri, Dec 18 2020

  News

  ​Prof. Ohkawa gave an online invited talk about AlGaN-MOVPE growth simulation. The talk explained the chemical process of nitride semiconductors’ MOVPE growth. http://cvd.jpn.org/future/
• 

  Prof. Ohkawa delivered an invited talk at OPTIC2020 in Taiwan

  1 min read · Fri, Dec 4 2020

  News

  Prof. Ohkawa gave an online invited talk about strain-compensated InGaN MQWs-based red LEDs at OPIC2020 (Optics & Photonics Taiwan International Conference). https://optic2020.conf.tw/site/page.aspx?pid=20&sid=1350&lang=en

November 2020

• 

  LED Professional announced our collaboration with ALLOS (Germany) on micro-LED displays

  1 min read · Mon, Nov 16 2020

  News

  ​ECO Devices Lab and ALLOS will develop a key technology for micro-LED displays. That is nitride-based red LEDs using synergy with GaN-on-Si technology. The title of this article is “Micro-LED displays: new opportunities for nitride-based red LED technologies”. https://www.led-professional.com/downloads/lpr82_full_812522​

October 2020

• 

  Graduate Seminar: Beyond Solid-State Lighting: Miniaturization and Integration of Nitride-based Visible LEDs

  1 min read · Sun, Oct 25 2020

  News

  Abstract This talk will give an overview of the research of III-nitride based visible light-emitting diodes (LEDs) from the KAUST Energy Conversion Devices and Materials (ECO Devices) Laboratory (https://ecodevices.kaust.edu.sa/Pages/Overview.aspx). III-nitride based visible LEDs have achieved tremendous success in the field of solid-state lighting and dominated the lighting markets in the past decades. This technique becomes mature, and the luminous efficacy of LED devices approaches the theoretical maximum limit. So what is the next story of visible LEDs beyond solid-state lighting? Nowadays
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  High-color-rendering-index phosphor-free InGaN-based white light-emitting diodes by carrier injection enhancement via V-pits

  1 min read · Sun, Oct 11 2020

  News

  The paper entitled "High-color-rendering-index phosphor-free InGaN-based white light-emitting diodes by carrier injection enhancement via V-pits" reports the growth of phosphor-free InGaN-based white light-emitting diodes by metalorganic vapor-phase epitaxy.​ Appl. Phys. Lett. 117, 172103 (2020).​ DOI: 10.1063/5.0026017​

September 2020

• 

  Enhanced performance of N-polar AlGaN-based deep-ultraviolet light-emitting diodes

  1 min read · Sat, Sep 19 2020

  News

  The paper entitled "Enhanced performance of N-polar AlGaN-based deep-ultraviolet light-emitting diodes" reports the numerically investigated the performance of N-polar AlGaN-based ultraviolet light-emitting diodes with different Al contents in quantum wells and barriers. Optics Express​ 28, 30423 (2020). DOI: 10.1364/OE.403168​​​
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  Prof. Ohkawa delivered a lecture at Division of Crystals Science and Technology

  1 min read · Mon, Sep 14 2020

  News

  ​Prof. Ohkawa delivered a lecture about science and technology of MOVPE for students and engineers from industries. https://annex.jsap.or.jp/kessho/contents/2020/school200914.html​
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  AlphaGalileo announced our research result about Nitride Oxide Photocatalyst

  1 min read · Wed, Sep 2 2020

  News

  ​​ECO Devices Lab has identified that the co-catalyst can significantly extend the working lifetime of solar fuel–generating photocatalysts. The article entitled “Standing the test of time with a perfect partner”. ​ Link: https://www.alphagalileo.org/en-gb/Item-Display/ItemId/196839?returnurl=https://www.alphagalileo.org/en-gb/Item-Display/ItemId/196839​​
• 

  Health Medicine Network announced our research result about Nitride Oxide Photocatalyst

  1 min read · Wed, Sep 2 2020

  News

  ECO Devices Lab has discovered that a form of iron oxide makes an excellent co-catalyst for a promising photocatalytic material called gallium nitride. The article entitled “Standing the test of time with a perfect partner”. ​ Link: https://healthmedicinet.com/standing-the-test-of-time-with-a-perfect-partner/​
• 

  Scienmag announced our research result about Nitride Oxide Photocatalyst

  1 min read · Tue, Sep 1 2020

  News

  ECO Devices Lab has identified that the co-catalyst can significantly extend the working lifetime of solar fuel–generating photocatalysts. The article entitled “Standing the test of time with a perfect partner”. ​ Link: https://scienmag.com/standing-the-test-of-time-with-a-perfect-partner/​
• 

  EurekAlert! announced our research result about Nitride Oxide Photocatalyst

  1 min read · Tue, Sep 1 2020

  News

  ECO Devices Lab has discovered that a form of iron oxide makes an excellent co-catalyst for a promising photocatalytic material called gallium nitride. The article entitled “Standing the test of time with a perfect partner”. ​ https://www.eurekalert.org/pub_releases/2020-09/kauo-stt090120.php​​
• 

  Standing the test of time with a perfect partner

  1 min read · Tue, Sep 1 2020

  News

  energy electrical engineering

  Identifying the ideal co-catalyst can significantly extend the working lifetime of solar fuel–generating photocatalysts.

August 2020

• 

  Accepted in eBook “Encyclopedia of Applied Physics” from Wiley

  1 min read · Tue, Aug 25 2020

  News

  ​The book entitled " Simulation of Nitride Semiconductor MOVPE" describes MOVPE growth and its mechanism of nitride semiconductors such as GaN, AlN, AlGaN, and InGaN. ​ https://doi.org/10.1002/3527600434.eap941​​

July 2020

• 

  Paper accepted in ASME InterPACK2020

  1 min read · Thu, Jul 23 2020

  News

  The paper entitled "LOCAL HEAT ENERGY TRANSPORT ANALYSES IN GALLIUM-INDIUM-NITRIDE/GALLIUM NITRIDE HETEROSTRUCTURE BY MICROSCOPIC RAMAN IMAGING EXPLOITING SIMULTANEOUS IRRADIATION OF TWO LASER BEAMS" reports the pump and probe method in Raman spectroscopy is valid for analyzing energy or heat transport across the heterointerface. This work is an international collaboration with Prof. Ishitani group at Chiba University. Proceedings of the ASME 2020 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems Paper No: IPACK2020-2570
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  MICROLED-info announced the collaboration with ALLOS

  1 min read · Tue, Jul 21 2020

  News

  ​GaN-on-Si developer ALLOS Semiconductors (in Germany) announced it is collaborating with ECO Devices Lab (KAUST) to develop high-​efficient nitride-based red LEDs on large diameter silicon substrates. https://www.microled-info.com/​
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  COMPOUND SEMICONDUCTOR announced the collaboration with ALLOS

  1 min read · Tue, Jul 21 2020

  News

  ​COMPOUND SEMICONDUCTOR announced that ALLOS and ECO Devices lab start the co-development of the high-efficiency nitride-based red LEDs on silicon. High-quality GaN-on-Si technique is attracted to develop the RGB micro-LEDs. https://compoundsemiconductor.net/article/111649/Allos_And_KAUST_Collaborate_On_Nitride_Red_LEDs​
• 

  Semiconductor Today announced the collaboration with ALLOS

  1 min read · Tue, Jul 21 2020

  News

  ​ALLOS and ECO Devices Lab start to co-development of the high-efficiency nitride-based red LEDs on silicon. High-quality GaN-on-Si technique is attracted to develop the RGB micro-LEDs. http://www.semiconductor-today.com/news_items/2020/jul/allos-210720.shtml​
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  LEDinside announced the collaboration with ALLOS

  1 min read · Tue, Jul 21 2020

  News

  ​ALLOS Semiconductors (in Germany) announced its collaboration with ECO Devices Lab at King Abdullah University of Science and Technology (KAUST) for realizing high efficiency nitride-based red LEDs on large diameter silicon substrates. https://www.ledinside.com/news/2020/7/allos_kaust_microled​
• 

  LEDinside announced the results from APL papers

  1 min read · Tue, Jul 21 2020

  News

  LEDinside is widely read by engineers in the fields of LEDs and LDs. The article focused on our research results about very stable red-light InGaN LEDs at high temperatures. The output power is more stable than that of AlInGaP red LEDs. https://www.ledinside.com/news/2020/7/red_microled_kaust
• 

  Photoelectrochemical and Crystalline Properties of a GaN Photoelectrode Loaded with α-Fe2O3 as Cocatalyst

  1 min read · Fri, Jul 10 2020

  News

  ​The paper entitled "Photoelectrochemical and Crystalline Properties of a GaN Photoelectrode Loaded with α-Fe2O3 as Cocatalyst" reports the investigation of the heterostructure with α-Fe2O​3​/GaN characterized by TEM observations. The analytical observation of TEM is significantly important to develop the new material and its relative devices.​ Sci Rep 10, 12586 (2020)​, DOI: 10.1038/s41598-020-69419-8
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  Red-light LEDs for next-generation displays

  1 min read · Sun, Jul 5 2020

  News

  LED electrical engineering

  Novel red LEDs are more temperature stable than those made using the conventional semiconductor of choice.

May 2020

• 

  True Viral News announced our research result about pure red LEDs

  1 min read · Fri, May 15 2020

  News

  ​ECO Devices Lab has succeeded in the novel red LEDs by our original MOCVD at KAUST for the first time. The article entitled “Pure red LEDs fulfill a primary goal” features the pure red LEDs with highly efficient and low-operating voltage made from nitride semiconductors. Link: https://trueviralnews.com/pure-red-leds-fulfill-a-primary-goal/​​
• 

  LEDinside announced about our pure red LED research

  1 min read · Thu, May 7 2020

  News

  ​LEDinside is announced our current research topics about pure red InGaN-LEDs. Our achievement is believed to support more efficient process of full-color Micro LED display development. https://www.ledinside.com/news/2020/5/kaust_red_led
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  Phys.org announced our research result about pure red LEDs

  1 min read · Thu, May 7 2020

  News

  ​​ECO Devices Lab has succeeded in making the novel red LEDs by MOCVD at KAUST. The article entitled “Pure red LEDs fulfill a primary goal” features the pure red LEDs with highly efficient and low-operating voltage made from nitride semiconductors. Link: https://phys.org/news/2020-05-pure-red-fulfill-primary-goal.html​
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  AZoOptics announced our research result about pure red LEDs by MOCVD

  1 min read · Thu, May 7 2020

  News

  ECO Devices Lab has been successful in making pure red LEDs by MOCVD for the first time. The article entitled “Researchers Make High-Intensity, Low-Voltage Red LEDs from Nitride Crystals” announces the pure red LEDs with highly efficient and low-operating voltage made from nitride semiconductors. ​​ Link: https://www.azooptics.com/News.aspx?newsID=24952​
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  Pure red LEDs fulfill a primary goal

  1 min read · Wed, May 6 2020

  News

  material science electrical engineering

  First high-intensity, low-voltage red LEDs made from nitride semiconductors.