荧光粉
分析化学(期刊)
光致发光
材料科学
发射光谱
发光二极管
发光
热稳定性
显色指数
熔块
化学
谱线
核化学
光电子学
物理
有机化学
色谱法
天文
冶金
作者
Rong Tang,Yue Yang,Ya Yang,Xuan Ouyang,Junzhi Che,Shigao Chen,Xuemei Yao,Ruijin Yu,Ruijin Yu
摘要
Abstract A sequence of reddish‐orange emitting NaSrBi (1− x ) TeO 6 : x Sm 3+ phosphors were successfully composited by a favorable solid‐phase chemical process. The sintering temperature is optimized as 850°C. NaSrBiTeO 6 (NSBTO):Sm 3+ samples were assigned to the cubic double‐perovskite structure, exhibiting the space group of Fm m (225). Photoluminescence emission spectra display the main peaks at 562, 598, 645, and 705 nm at 404 nm excitation. Among them, the most intense emission peak is at 645 nm. The concentration‐quenching mechanism of Sm 3+ follows the interaction between electric dipoles and quadrupoles. The asymmetric ratio (I( 4 G 5/2 ‐ 6 H 9/2 )/I( 4 G 5/2 ‐ 6 H 5/2 ) of NSBTO:2 mol%Sm 3+ phosphor is extracted as 4.96. The optimum NSBTO:2 mol%Sm 3+ phosphor has excellent thermal stability with a remained emission intensity riches 93.61% (420 K). After testing with high‐pressure water steam at various periods, the phosphor remains chemically stable for moisture resistance. For the NSBTO:2 mol%Sm 3+ phosphor, the satisfactory color purity and low correlated color temperature (CCT) are obtained with 99.9% and 1494 K, respectively. The electroluminescence spectra of the prepared red light emitting diode (LED) are in conformity with the phytochrome absorption spectra of chlorophyll a, chlorophyll b, P FR , and P R . The white light‐emitting diode (w‐LED) is also perfectly packaged, obtaining an efficient color rendering index ( R a ) of 92.12 and CCT of 5553 K. These exceeding optical properties certified that NaSrBi (1− x ) TeO 6 : x Sm 3+ demonstrates promising prospects and can be efficiently applied in horticultural LED applications.
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