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

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 > Aston Institute of Photonics Technology
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
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
http://www.mdpi ... 6-3417/8/7/1158 (Publisher URL)
PURE Output Type: Article
Published Date: 2018-07-17
Accepted Date: 2018-07-13
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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