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We packaged a series of high power white LEDs by covering the blue LED chips with yellow phosphor, red phosphor and the two phosphors mixed by appropriate mass ratio, respectively, and discussed the excitation and emission spectrum of yellow phosphor and red phosphor and the characteristics of the LEDs. We found that the luminous efficacy of the white LEDs covered with the two phosphors mixed by appropriate mass ratio was lower than that of the white LEDs covered with yellow phosphor, but the color rendering index was improved observably. 相似文献
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We packaged a series of high power white LEDs by covering the blue LED chips with yellow phosphor, red phosphor and the two phosphors mixed by appropriate mass ratio,respectively,and discussed the excitation and emission spectrum of yellow phosphor and red phosphor and the characteristics of the LEDs.We found that the luminous efficacy of the white LEDs covered with the two phosphors mixed by appropriate mass ratio was lower than that of the white LEDs covered with yellow phosphor,but the color rendering index was improved observably. 相似文献
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研究了M3Gd(PO4)3:Tm^3+(M=Mg,Ca,Sr,Ba)样品的结构特性、发光特性。M3Gd(PO4)3:Tm^3+属于立方晶系。基质掺入铥离子后其结构没有明显变化。M3Gd(PO4)3:Tm^3+在166nm和210nm附近有强烈的吸收峰。位于166nm附近的强烈吸收峰归因于基质的强烈吸收,210nm附近的吸收峰则归因于Gd^3+的^8S7/2-^6GJ的能级跃迁。在166nm真空紫外光激发下,样品在453nm及363nm处有较强的发射峰,发射主峰位于453nm。随着样品中阳离子的变化,M3Gd(PO4)3:Tm^3+的激发峰发生强烈变化,从而导致其发射光谱有了较大变化。 相似文献
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研究了M3Gd(PO4)3Tm3+(M=Sr,Ba,Ca,Mg)样品的结构特性、发光特性.M3Gd(PO4)3Tm3+属于立方晶系.基质掺入铥离子后其结构没有明显变化.M3Gd(PO4)3Tm3+在166 nm和210 nm附近有强烈的吸收峰.位于166 nm附近的强烈吸收峰归因于基质的强烈吸收,210 nm附近的吸收峰则归因于Gd3+的8S7/2-6GJ的能级跃迁.在166 nm真空紫外光激发下,样品在453 nm及363 nm处有较强的发射峰,发射主峰位于453 nm.随着样品中阳离子的变化,M3Gd(PO4)3Tm3+的激发峰发生强烈变化,从而导致其发射光谱有了较大变化. 相似文献
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