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Luminescence Characteristics and Vibronic Coupling Behavior of a Highly Efficient Eu2+-Activated RbLi7Si2O8 Green Phosphor for Wide Color Gamut WLEDs
ACS Applied Electronic Materials ( IF 4.7 ) Pub Date : 2020-11-06 , DOI: 10.1021/acsaelm.0c00779
Fei Tang 1 , Haoqi Li 2 , Kangzhen Tian 1 , Shijie Xu 3 , Xiaojun Wang 1 , Chenhui Xie 1 , Honggang Ye 2 , Yongge Cao 4
Affiliation  

Hunting for a type of green phosphor with outstanding properties is of much significance for improving the performance of display backlights. In this work, a series of efficient Eu2+-activated RbLi7Si2O8 (denoted as RLSO:Eu2+) green phosphors with different doping concentrations were prepared via a low-temperature solid-state reaction approach under a reduced atmosphere. Photoluminescence (PL) measurements show that the prepared green phosphor with 8 atom % doping concentration of Eu exhibits the best internal quantum yield (IQY) of 95.8%. Besides, the phosphor delivers a good anti-thermal quenching behavior at temperatures <200 K, that is, there is no significant drop in luminescence intensity. Such thermal behavior is well consistent with the temperature dependence of measured luminescence lifetimes. The spectral analysis of the low-temperature luminescence spectrum with a semiclassical time-dependent approach reveals that three electronic levels of the Eu2+ ion coupled with a common low-frequency vibrational phonon mode with an energy of 21 meV shall be responsible for the high-efficiency luminescence of the prepared phosphor. Using the as-prepared green phosphor and K2SiF6:Mn4+ red phosphor, a white light-emitting diode (LED) device with high luminous efficacy (111.08 lm/W) and wide color gamut (112% NTSC) is fabricated on an InGaN blue chip.

中文翻译:

高效Eu 2+激活的RbLi 7 Si 2 O 8绿色荧光粉在宽色域WLED上的发光特性和振动耦合特性

寻找一种具有优异性能的绿色荧光粉对于改善显示器背光源的性能具有重要意义。在这项工作中,一系列有效的Eu 2+活化的RbLi 7 Si 2 O 8(表示为RLSO:Eu 2+通过还原性气氛下的低温固态反应方法制备了不同掺杂浓度的绿色荧光粉。光致发光(PL)测量表明,所制得的Eu掺杂浓度为8原子%的绿色荧光粉表现出95.8%的最佳内部量子产率(IQY)。此外,磷光体在<200 K的温度下具有良好的抗热淬火性能,也就是说,发光强度没有明显下降。这种热行为与测得的发光寿命的温度依赖性非常一致。用半经典时间依赖方法对低温发光光谱进行的光谱分析表明,Eu 2+的三个电子能级离子与能量为21 meV的普通低频振动声子模式耦合,应负责制备的磷光体的高效发光。使用所制备的绿色磷光体和K 2 SiF 6:Mn 4+红色磷光体,制造具有高发光效率(111.08 lm / W)和宽色域(112%NTSC)的白光发光二极管(LED)器件。在InGaN蓝色芯片上。
更新日期:2020-11-25
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