荧光粉
发光二极管
显色指数
光电子学
材料科学
色温
光学
渲染(计算机图形)
量子效率
绿灯
物理
蓝光
计算机科学
计算机图形学(图像)
作者
Yan Wang,Jianwei Dao,Zhihao Jiang,Zihao Han,Liang Yang,Tiqun Wei,An Xie,Zhicheng Lv
标识
DOI:10.1016/j.jallcom.2025.180514
摘要
Efficient green phosphors with high internal quantum efficiency (IQE) are crucial for developing high color rendering white light-emitting diodes (LEDs). Herein, through co-substituting cation sites, Y 3+ /Al 3+ are replaced by Ba 2+ /Si 4+ respectively in the Y 3 Al 5 O 12 (YAG) lattice, yielding novel Ce 3+ -doped BaY 2 Al 4 SiO 12 (BYAS) green phosphors with symmetrical and stable structure similar to that of YAG . Notably, the BY 1.94 AS:0.06Ce 3+ phosphor exhibits exceptional IQE of 96.4 %. Upon adjusting the Ce 3+ doping concentration, the optimal BY 1.94 AS:0.06Ce 3+ phosphor shows green emission at 533 nm and a broad full width at half maximum of 87 nm under 469 nm excitation. The emission spectrum ranges from 500 to 700 nm, primarily due to the characteristic 5d to 4 f transitions of Ce 3+ ions. The BY 1.94 AS:0.06Ce 3+ phosphor retains 67.7 % of its initial intensity at 423 K (E a = 0.241 eV), demonstrating high thermal stability. As-prepared BY 1.94 AS:0.06Ce 3+ green phosphor and commercial CaAlSiN 3 :Eu 2+ red phosphors were combined with InGaN blue chip to fabricate a white LEDs device. The device exhibits warm white light with a high color rendering index Ra = 85.9, R9 = 41.1), a low correlated color temperature (5064 K) and an excellent luminous efficiency (80.24 lm/W). This work suggests that the novel high-efficiency BYAS:Ce 3+ green phosphors possess significant potential for achieving high color rendering in warm-white LEDs. • Unprecedented Quantum Efficiency: Achieves an exceptional internal quantum efficiency (IQE) of 96.4 % under 469 nm excitation. • Innovative Structure: Co-substitution of Y 3+ /Al 3+ with Ba 2+ /Si 4+ in the YAG lattice yields stable iridium-aluminum garnet structure. • Robust Thermal Stability: Maintains 67.7 % of initial intensity at 150 °C, ensuring reliable performance in high-temperature applications. • Enhanced Color Rendering: Combines with red phosphors to produce warm white light with a high color rendering index Ra = 85.9) and low correlated color temperature (5064 K).
科研通智能强力驱动
Strongly Powered by AbleSci AI