New generation of a single-chip LEDs with superior colour rendering emission

4^th International Conference on Photonics & Laser Technology

July 28-29, 2016 Berlin, Germany

E U Rafailov, I E Titkov, A Yadav, S Yu Karpov, T Slight, A V Sakharov and A F Tsatsulnikov

Aston University, UK
STR Group � Soft-Impact., Ltd, Russia
Compound Semiconductor Technologies Global, UK
Ioffe Physico-Technical Institute, Russia

Scientific Tracks Abstracts: J Laser Opt Photonics

Abstract :

Development of LED-based solid state lighting has led to understanding that various lighting applications provide very different requirements to the quality and characteristics of white light. The mainstream applications, like outdoor (street) and indoor lightings are primarily aimed at saving electricity consumption and, therefore, need maximum efficacy and minimum cost of white-light source. Warm-white emission with superior CRI is demonstrated using a di-chromatic monolithic InGaN multiple quantum well LED and two phosphors. The LED emitting simultaneously blue (440 nm) and cyan (480 nm) photons pumps the vertically stacked red (~ 620 nm) and green (~540 nm) phosphor. An excellent average colour rendering index, CRI (Ra) of 98.4 with CCT of 3400 K is achieved. With appropriate heat sink assembly and industry standard packaging to improve extraction efficiency we estimate these devices can achieve Luminous Efficacy and Wall-plug Efficiency (WPE) of more than 160 lm/W and 55% respectively.

Biography :

E U Rafailov received the PhD degree from the Ioffe Institute. In 2005, he established new group and in 2014, he and his Optoelectronics and Biomedical Photonics Group moved to Aston University. He has authored and co-authored over 400 articles in refereed journals and conference proceedings. He has coordinated a €14.7M FP7 FAST-DOT project – development of new ultrafast lasers for Biophotonics applications. Currently, he coordinated the €11.8M NEWLED project which aims to develop a new generation of white LEDs. He also leads a few others projects funded by FP7 EU and EPSRC (UK). His current research interests include high-power CW, ultrashort-pulse lasers; generation of UV/visible/IR/MIR and THz radiation, nano-structures; nonlinear and integrated optics; Biophotonics.

Email: e.rafailov@aston.ac.uk