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首页> 外文期刊>RSC Advances >Color tunable emission and energy transfer in LaSi3N5:Ce3+,Tb3+ phosphors for UV white LEDs
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Color tunable emission and energy transfer in LaSi3N5:Ce3+,Tb3+ phosphors for UV white LEDs

机译：LaSi 3 N 5 ：Ce 3 + ，Tb 3 + 荧光粉中用于紫外线的颜色可调发射和能量转移白光LED

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A series of new blue-green emitting LaSi3N5:Ce3+,Tb3+ phosphors were obtained through a high temperature solid-state method. The crystal structure, photoluminescence properties and energy transfer from Ce3+ to Tb3+ were investigated. The doped ions Ce3+ and Tb3+ were confirmed to occupy the same crystallographic sites as La3+ using a Rietveld structure refinement method. The emission spectra of these phosphors was composed of a blue emission band attributed to the d–f transition of Ce3+, together with several sharp lines ascribed to the emission of Tb3+ under UV light excitation. Thus a color tunable emission from blue to green was obtained via controlling the doping concentration of Tb3+. In addition, the mechanism of energy transfer, efficiency of energy transfer, chromaticity coordinates and thermal stability of these phosphors were investigated. The results indicated that the Ce3+,Tb3+ co-activated LaSi3N5 phosphors with color-tunable blue-green emission and high quantum efficiency may have potential for UV white LEDs.
机译：一系列新的发出蓝绿色的LaSi 3 N 5 ：Ce 3+通过高温固态法获得了 ，Tb 3 + 荧光粉。研究了Ce 3 + 到Tb 3 + 的晶体结构，光致发光性质和能量转移。掺杂离子Ce 3 + 和Tb 3 + 被确认与La 3 + 使用Rietveld结构细化方法。这些磷光体的发射光谱由蓝色发射带组成，该发射带归因于Ce 3 + 的d–f跃迁，以及几条归因于Tb发射的清晰线条在紫外线激发下 3 + 因此，通过控制Tb 3 + 的掺杂浓度 获得了从蓝色到绿色的可调光发射。此外，还研究了这些荧光粉的能量转移机理，能量转移效率，色度坐标和热稳定性。结果表明Ce 3 + ，Tb 3 + 共激活LaSi 具有颜色可调的蓝绿色发射和高量子效率的3 N 5 荧光粉可能具有用于UV白光LED的潜力。

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