Abstract A novel Tm3+/Tb3+/Sm3+ tri-doped Na5Y9F32 single crystal was synthesized by a modified Bridgman method for the propose of white light emitting diodes. The fluorescence spectra of various Sm3+ ion concentrations and fixed 0.4 mol% Tm3+ and 0.5 mol% Tb3+ were measured and studied systematically excited by near-ultraviolet light of 355 nm. The Sm3+ ion concentration takes apparent effect on the relative intensity of peaks in the visible region and the color coordinate combining from these emission bands. A near pure white light emission with color coordinates (0.3295, 0.3057) and color temperature (5657 K) can be obtained when the concentrations of Tm3+, Tb3+ and Sm3+ ions are 0.4 mol%, 0.5 mol% and 0.8 mol%, respectively. Furthermore, the practical down-conversion internal quantum yield was measured by integrating spheres at about 14.39%. The tri-doped Na5Y9F32 single crystal shows a high thermal stability inferring from the temperature dependent emission in which the integrated emission intensities are reduced only by ∼3% with the increase of temperature from 280 to 450 K. The present results demonstrate that the Tm3+/Tb3+/Sm3+ tri-doped Na5Y9F32 single crystal may provide a promising candidate for white light-emitting diodes, luminescent materials and fluorescent display devices.

中文翻译：

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Tm3+/Tb3+/Sm3+三掺杂Na5Y9F32高热稳定性白光发光二极管单晶的光致发光特性

摘要 针对白光发光二极管的提出，采用改进的布里奇曼法合成了一种新型的Tm3+/Tb3+/Sm3+三掺杂Na5Y9F32单晶。测量并系统研究了各种 Sm3+ 离子浓度和固定 0.4 mol% Tm3+ 和 0.5 mol% Tb3+ 的荧光光谱，这些光谱在 355 nm 近紫外光下激发。Sm3+ 离子浓度对可见光区峰的相对强度和这些发射带的色坐标组合有明显的影响。当 Tm3+、Tb3+ 和 Sm3+ 离子的浓度分别为 0.4 mol%、0.5 mol% 和 0.8 mol% 时，可以获得具有色坐标（0.3295、0.3057）和色温（5657 K）的近纯白光发射。此外，实际下转换内部量子产率是通过积分球测量的，约为 14.39%。