Di-chromatic InGaN based color tuneable monolithic LED with high color rendering index

Yadav, Amit, Titkov, Ilya E., Sakharov, Alexei V., Lundin, Wsevolod V., Nikolaev, Andrey E., Sokolovskii, Grigorii S., Tsatsulnikov, Andrey F. and Rafailov, Edik U. (2018). Di-chromatic InGaN based color tuneable monolithic LED with high color rendering index. Applied Sciences (Switzerland), 8 (7),

Abstract

We demonstrate a phosphor free, dichromatic GaN-based monolithic white LED with vertically stacked green and blue emitting multiple quantum wells. The optimal thickness of GaN barrier layer between green and blue quantum wells used is 8 nm. This device can be tuned over a wide range of correlated color temperature (CCT) to achieve warm white (CCT = 3600 K) to cool white (CCT = 13,000 K) emission by current modulation from 2.3 A/cm2 to 12.9 A/cm2. It is also demonstrated for the first time that a color rendering index (CRI) as high as 67 can be achieved with such a dichromatic source. The observed CCT and CRI tunability is associated with the spectral power evolution due to the pumping-induced carrier redistribution.

Publication DOI: https://doi.org/10.3390/app8071158
Divisions: Engineering & Applied Sciences > Institute of Photonics
Additional Information: ©2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords: Color rendering,Colorimetry,High CRI,Light-emitting diodes,Monolithic LED,Materials Science(all),Instrumentation,Engineering(all),Process Chemistry and Technology,Computer Science Applications,Fluid Flow and Transfer Processes
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
http://www.mdpi ... 6-3417/8/7/1158 (Publisher URL)
Published Date: 2018-07-17
Authors: Yadav, Amit
Titkov, Ilya E.
Sakharov, Alexei V.
Lundin, Wsevolod V.
Nikolaev, Andrey E.
Sokolovskii, Grigorii S.
Tsatsulnikov, Andrey F.
Rafailov, Edik U. ( 0000-0002-4152-0120)

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