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Three Birds with One Stone: K 2 SiF 6 :Mn 4+ Single Crystal Phosphors for High‐Power and Laser‐Driven Lighting
Author(s) -
Zhou Yayun,
Yu Changkai,
Song Enhai,
Wang Yuanjing,
Ming Hong,
Xia Zhiguo,
Zhang Qinyuan
Publication year - 2020
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.202000976
Subject(s) - materials science , backlight , phosphor , luminous efficacy , luminous flux , color rendering index , laser , optoelectronics , color temperature , diode , blue laser , thermal stability , quantum efficiency , optics , liquid crystal display , layer (electronics) , nanotechnology , chemical engineering , physics , light source , engineering
Narrow‐band red‐emitting fluoride phosphors play a crucial role in lighting and backlight displays, whereas the stability issue is a major challenge. Here, highly stable K 2 SiF 6 :Mn 4+ (KSFM) single crystal phosphors with tunable sizes (20–1000 µ m) are grown by a facile saturated crystallization method. The small specific surface area together with the unique Mn 4+ ‐rare interface layer in KSFM single crystals enables the simultaneous fulfillment of high external quantum efficiency, excellent moisture, improved thermal quenching, and dissipation for high‐power and laser‐driven lighting applications. As a prototype, a warm white laser diode device with a high luminous flux of 202.7 lm and correlated color temperature of 3277 K, as well as a color rendering index of 87.9 is presented. This work provides new insights into the development of highly efficient and stable materials for advanced lighting applications.