Non-equivalent Mn4 doping into A(2)NaScF(6) (A = K, Rb, Cs) hosts toward short fluorescence lifetime for backlight display application
Non-equivalent Mn4 doping into A(2)NaScF(6) (A = K, Rb, Cs) hosts toward short fluorescence lifetime for backlight display application
复制标题
非等量 Mn4 掺杂到 A(2)NaScF(6) (A = K、Rb、Cs) 中会导致背光显示应用的荧光寿命缩短
DOI：
10.1039/c9tc02564b
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发表时间：
2019
影响因子：
6.4
通讯作者：
Zhang Q Y
中科院分区：
文献类型：
--
作者：
Zhou Y Y;Song E H;Brik M G;Wang Y J;Hu T;Xia Z G;Zhang Q Y
研究了用于背光白光二极管（wled）的掺Mn4+氟红发荧光粉。然而，当Mn4+掺杂到A2XF6中等效的X位点（A = Na， K, Rb, Cs; X = Si, Ge, Ti, Zr）时，较长的荧光寿命（τ > 5 ms）导致人眼的图像保留现象。本文报道了一种荧光寿命短（τ < 4 ms）且具有零声子线（ZPL）发射特性的新型发红光的A2NaScF6:Mn4+ (A = K, Rb, Cs) （ANSF）荧光粉，该荧光粉可以通过在Sc3+位点中非等效掺杂Mn4+来实现。密度泛函理论（DFT）计算证实了Mn4+微扭曲环境和Na+空位的形成，以平衡Mn4+非等效掺杂的电荷。采用ANSF作为红光元件的WLED背光可达到美国国家电视标准委员会（NTSC）标准105%以上的宽色域，与使用商用K2SiF6:Mn4+背光相比，可有效避免背光屏幕上的图像保留。这种Mn4+非等效掺杂策略为修饰Mn4+掺杂的红发氟化物荧光粉的局部对称性和增强发光性能开辟了新的视角。
Mn4+-doped fluoride red-emitting phosphors have been developed for backlighting white light-emitting diodes (WLEDs). However, the long fluorescence lifetime (τ > 5 ms) leads to the image-retention phenomenon for the human eye when Mn4+ is doped into equivalent X sites in A2XF6 (A = Na, K, Rb, Cs; X = Si, Ge, Ti, Zr). Herein, we report on novel red-emitting A2NaScF6:Mn4+ (A = K, Rb, Cs) (ANSF) phosphors with short fluorescence lifetimes (τ < 4 ms) and characteristic zero phonon line (ZPL) emission, which can be realized via non-equivalent doping of Mn4+ into Sc3+ sites. Density functional theory (DFT) calculations verified the formation of a slightly distorted environment of Mn4+ and an Na+ vacancy to balance the charge with Mn4+ non-equivalent doping. The WLED backlight using ANSF as a red-light component can reach a wide color gamut above 105% of the National Television Standards Committee (NTSC) standard, and the image-retention on the backlighted screen can be effectively avoided compared to the backlight obtained using commercial K2SiF6:Mn4+. Such a Mn4+ non-equivalent doping strategy opens a new perspective for the modification of local symmetry and enhancement of the luminescence properties of Mn4+-doped red-emitting fluoride phosphors.