Three Birds with One Stone: K2SiF6:Mn4+ Single Crystal Phosphors for High-Power and Laser-Driven Lighting

作者：Zhou, Yayun; Yu, Changkai; Song, Enhai; Wang, Yuanjing; Ming, Hong; Xia, Zhiguo; Zhang, Qinyuan^*

来源：Advanced Optical Materials, 2020, 8(23): 2000976.

DOI：10.1002/adom.202000976

• high&#8208
• power white LEDs
• laser lighting
• red emission
• single crystal phosphors

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 K2SiF6:Mn4+ (KSFM) single crystal phosphors with tunable sizes (20-1000 mu m) are grown by a facile saturated crystallization method. The small specific surface area together with the unique Mn4+-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.

• 单位
  复旦大学