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CdTe quantum dots and YAG hybrid phosphors for white light‐emitting diodes
Author(s) -
Yin Yanchun,
Wang Rongfang,
Zhou Liya
Publication year - 2014
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2595
Subject(s) - phosphor , color rendering index , quantum dot , optoelectronics , light emitting diode , cadmium telluride photovoltaics , diode , materials science , excited state , color temperature , optics , doping , physics , atomic physics
CdTe quantum dots, 3.28 nm in size, were synthesized using a one‐step method in an aqueous medium. The CdTe quantum dots were successfully employed as hybrid phosphors for white light‐emitting diode (LED) devices by combining them with yellow‐emitting YAG:Ce phosphor. The color‐rendering index value and International Commission on illumination coordinates for hybrid phosphor white LEDs were 75 and ( x = 0.30, y = 0.29), respectively. Compared with conventional phosphors, semiconductor quantum dots have larger band gap energy and broader absorption features, and can be excited more efficiently by optical pumping sources. The results confirmed that the high color‐rendering index value of the white LED was due to the CdTe quantum dots introduced in the hybrid phosphor system. Copyright © 2013 John Wiley & Sons, Ltd.