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Phosphor–Aluminum Composite for Energy Recycling with High‐Power White Lighting
Author(s) -
Park Jehong,
Kim Jongsu,
Kwon Hansang
Publication year - 2017
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201700347
Subject(s) - phosphor , materials science , chromaticity , luminous flux , optoelectronics , solid state lighting , thermal stability , led lamp , composite number , light emitting diode , luminous efficacy , diode , color rendering index , color temperature , optics , composite material , layer (electronics) , chemical engineering , physics , light source , engineering
A state‐of‐the‐art solid‐state lighting (SSL) device comprises a blue light‐emitting device covered with a yellow‐emitting phosphor. In a high‐power SSL device, thermal stability is an essential requirement for the phosphor because the phosphor is constantly irradiated with high‐power blue light, which causes thermal degradation. In this work, a thermally robust phosphor–aluminum composite (PAC) fused with low‐melting glass is introduced. The PAC exhibits a high thermal conductivity of 31.6 W m −1 K −1 and the PAC combined with a 4 W blue laser diode (LD) exhibits excellent thermal stability in luminous flux and chromaticity. Furthermore, energy is recycled in the PAC during lighting by coupling to a thermoelectric (TE) module. In the PAC‐TE system, the output voltage and current reveal 289 mV and 77 mA, respectively, at an output of 430 lumens under a 4 W blue LD. The results provide a starting point for further research in the composite‐material design for energy recycling with high‐power white lighting.