Highly Efficient and Stable Narrow-Band Red Phosphor Cs2SiF6:Mn4+ for High-Power Warm White LED Applications

• DOI: 10.1021/acsphotonics.7b00852
• Publication Date: 2017-09-15T16:28:54Z
• Authors: Enhai Song; Yayun Zhou; Xiao-Bao Yang; Zifeng Liao; Weiren Zhao; Tingting Deng; Lingyan Wang; Yanyan Ma; Shi Ye; Qinyuan Zhang
• Keywords: Quantum Efficiency; Luminous efficacy

Due to the unique narrow-band red emission and broadband blue light excitation, as well milder synthesis conditions, Mn4+ ion activated fluoride phosphors show great promise for white emitting diode (W-LED) applications. However, belongs a spin-forbidden transition (2Eg → 4A2), it is fundamental challenge synthesize these with high external quantum efficiency (EQE) above 60%. Herein, highly efficient thermally stable phosphor, Cs2SiF6:Mn4+, internal (IQE) of 89% ultrahigh EQE 71% demonstrated. Furthermore, nearly 95% room-temperature IQE are maintained at 150 °C. The static dynamic spectral measurements, density functional theory (DFT) calculations, that excellent performance Cs2SiF6:Mn4+ due ions being evenly distributed in host lattice Cs2SiF6. By employing component, 10 W high-power warm W-LEDs luminous ∼110 lm/W could be obtained. These findings indicate phosphor may suitable candidate fabricating high-performance LEDs.