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Bright cyan-to-green color-tunable emissions from Ce3+/Tb3+ co-activated garnet phosphors for high-color-quality solid-state lighting
Materials Today Energy ( IF 9.0 ) Pub Date : 2020-07-30 , DOI: 10.1016/j.mtener.2020.100487
Liangling Sun , Jia Liang , Shaoying Wang , Qi Sun , Balaji Devakumar , Xiaoyong Huang

High-efficiency near-UV excitable inorganic phosphors with tunable emissions are highly demanded for white light-emitting diodes (LEDs) and displays. In this paper, a series of color-tunable cyan-green-emitting Ca2Lu0.99-xZr2(AlO4)3:1%Ce3+,xTb3+ (CLZA:1%Ce3+,xTb3+) phosphors was synthesized via a high-temperature solid-state reaction method. Their crystal structure, morphology, emission and excitation spectra, energy transfer properties, CIE color coordinates, internal quantum efficiency and temperature-dependent spectra were systematically researched. Impressively, these CLZA:1%Ce3+,xTb3+ phosphors showed an intense excitation band in the 370–475 nm wavelength range with a peak at 408 nm corresponding to the 4f→5d transitions of Ce3+ ions. Owing to the energy transfer from Ce3+ to Tb3+ ions, bright cyan-to-green color-tunable emissions were obtained in CLZA:1%Ce3+,xTb3+ phosphors with an increase of the Tb3+ doping concentration, and the corresponding CIE color coordinates changed from (0.156, 0.249) to (0.341, 0.533) when the Tb3+ doping concentration increased from x = 0 to 90%. The internal quantum efficiency reached up to 69%. Moreover, temperature-dependent spectra demonstrated good thermal stability and color stability of the as-prepared Ce3+/Tb3+ doped Ca2LuZr2(AlO4)3 phosphors. In addition, a white LED device was fabricated by coating the blend of the as-prepared cyan-emitting CLZA:1%Ce3+,10%Tb3+ phosphor and commercial red phosphor CaAlSiN3:Eu2+ on a 400 nm LED chip, which exhibited bright warm-white light with CIE coordinates of (0.425, 0.376), low correlated color temperature of 2,975 K and high color rendering index value of Ra = 83 and R9 = 89. These results revealed that the CLZA:Ce3+,Tb3+ phosphors could be excellent candidates for the application of near-UV-excited warm-white LEDs.



中文翻译:

Ce 3+ / Tb 3+共激活的石榴石磷光体发出的蓝绿色到绿色可调光,用于高质量彩色固态照明

对于白色发光二极管(LED)和显示器,对具有可调发射的高效近紫外可激发无机磷光体有很高的要求。本文研究了一系列可发射蓝绿色的可调节颜色的Ca 2 Lu 0.99- x Zr 2(AlO 43:1%Ce 3+x Tb 3+(CLZA:1%Ce 3+x Tb 3+通过高温固态反应方法合成磷光体。系统地研究了它们的晶体结构,形态,发射和激发光谱,能量转移性质,CIE色坐标,内部量子效率和温度相关光谱。令人印象深刻的是,这些CLZA:1%Ce 3+x Tb 3+磷光体在370-475 nm波长范围内显示出很强的激发带,在408 nm处的峰对应于Ce 3+离子的4 f →5 d跃迁。由于从Ce 3+到Tb 3+离子的能量转移,在CLZA中获得了明亮的从青色到绿色的可调发射:1%Ce 3+X3+磷光体与增加了的Tb 3+从(0.156,0.249)变化为掺杂浓度,以及相应的CIE颜色坐标(0.341,0.533),当Tb的3+的掺杂浓度从增加的X  = 0至90 %。内部量子效率高达69%。此外,温度依赖性光谱证明了所制备的掺杂Ce 3+ / Tb 3+的Ca 2 LuZr 2(AlO 43荧光粉具有良好的热稳定性和颜色稳定性。另外,通过涂覆制备的发蓝光的CLZA:1%Ce 3+的混合物来制造白色LED器件。400 nm LED芯片上的,10%Tb 3+荧光粉和商业红色荧光粉CaAlSiN 3:Eu 2+,显示出明亮的暖白光,CIE坐标为(0.425,0.376),低相关色温为2,975 K,并且高显色指数值分别为Ra = 83和R9 =89。这些结果表明,CLZA:Ce 3+,Tb 3+荧光粉可能是应用近紫外线激发的暖白LED的极佳候选材料。

更新日期:2020-07-30
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