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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Crystal structure and luminescence properties of (Ca _(2.94-x)Lu_xCe_(0.06)) (Sc_(2-y)Mg _y)Si_3O_(12)phosphors for white LEDs with excellent colour rendering and high luminous efficiency
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Crystal structure and luminescence properties of (Ca _(2.94-x)Lu_xCe_(0.06)) (Sc_(2-y)Mg _y)Si_3O_(12)phosphors for white LEDs with excellent colour rendering and high luminous efficiency

机译：（Ca _（2.94-x）Lu_xCe_（0.06））（Sc_（2-y）Mg _y）Si_3O_（12）磷光体的晶体结构和发光特性，具有出色的显色性和高发光效率

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摘要

Lu-modified (Ca_(2.94-x)Lu_xCe_(0.06))(Sc _(2-y)Mgy)Si_3O_(12) (CLSMS:Ce ~(3+)) yellow emitting phosphors are prepared by a solid-state reaction. Controllable luminescent intensity and emitting colour are studied as a function of Lu and Mg contents. Fixing the Mg content to be 1, the effect of Lu content on crystal phase formation, luminescence properties and temperature characteristics is studied. It is revealed that the Lu-induced luminescent enhancement is the result of an increase in absorbance of Ce~(3+) rather than the internal quantum efficiency. Intense and broadband emission is realized by controlling the Lu content to obtain a pure CLSMS crystal phase. The maximum luminescence intensity is obtained at x = 0.54, which is as high as 156% of the Lu-free phosphor. The Lu-containing phosphor also exhibits better temperature characteristics for its big activation energy (0.20 eV) than the Lu-free one (0.18 eV). Combining the present phosphor with a blue light-emitting diode (LED) chip, a white LED with an excellent colour rendering index R a of 86 and a high luminous efficiency of 86 lmW-1 is obtained. The results of the present study demonstrate that the CLSMS:Ce ~(3+) phosphors show a good performance and are attractive candidates for commercial applications when used in white LEDs.
机译：通过固相反应制备出Lu改性的（Ca_（2.94-x）Lu_xCe_（0.06））（Sc_（2-y）Mgy）Si_3O_（12）（CLSMS：Ce〜（3+））发黄光的磷光体。研究了可控的发光强度和发光颜色随Lu和Mg含量的变化。将Mg含量固定为1，研究了Lu含量对晶相形成，发光性能和温度特性的影响。揭示了Lu诱导的发光增强是Ce〜（3+）吸光度增加而不是内部量子效率增加的结果。通过控制Lu含量以获得纯CLSMS晶体相，可以实现强而宽泛的发射。在x = 0.54处获得最大发光强度，高达无Lu磷光体的156％。含Lu的荧光粉的活化能（0.20 eV）也比不含Lu的荧光粉（0.18 eV）更好，具有更好的温度特性。将本发明的磷光体与蓝色发光​​二极管（LED）芯片组合，可获得具有优异的显色指数R a为86且发光效率为86 lmW-1的白色LED。本研究的结果表明，CLSMS：Ce〜（3+）荧光粉在白光LED中使用时显示出良好的性能，并且是商业应用中有吸引力的候选材料。

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