A novel phosphor for glareless white light-emitting diodes
A novel phosphor for glareless white light-emitting diodes
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DOI：
10.1038/ncomms2138
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发表时间：
2012-10-01
影响因子：
16.6
通讯作者：
Hosono, Hideo
中科院分区：
文献类型：
--
作者：
Daicho, Hisayoshi;Iwasaki, Takeshi;Hosono, Hideo
作为下一代照明用光源的白色发光二极管的发光效率不断提高。目前可用的白色发光二极管以极高的亮度发射，因为它们的发射面积比常规光源的发射面积小得多。因此，白色发光二极管产生人眼不舒服的眩光。本文报道了一种黄光荧光粉，Eu ~（2+）掺杂的氯偏硅酸盐（Ca ~（1-x-y，Sr-x，Eu-y）（7）（SiO ~ 3）（6）Cl ~-2，它可用于制作无眩光的白色发光二极管。（Ca 1-x-y，Sr-x，Eu-y）（7）（SiO 3）（6）Cl-2表现出大的斯托克斯位移，有效地将紫色激发光转换为黄色发光，并且基于该主体材料的磷光体具有比其它磷光体少得多的蓝色吸收。我们使用晶体结构分析来确定所需发光的来源，并且我们使用（Ca 1-x-y，Sr-x，Eu-y）（7）（SiO 3）（6）Cl-2和蓝色发光磷光体与紫色芯片组合来制造具有大发射面积并且适合于一般照明的无眩光白色发光二极管。
The luminous efficiency of white light-emitting diodes, which are used as light sources for next-generation illumination, is continuously improving. Presently available white light-emitting diodes emit with extremely high luminance because their emission areas are much smaller than those of conventional light sources. Consequently, white light-emitting diodes produce a glare that is uncomfortable to the human eye. Here we report a yellow-emitting phosphor, the Eu2+-doped chlorometasilicate (Ca1-x-y,Sr-x,Eu-y)(7)(SiO3)(6)Cl-2, which can be used to create glareless white light-emitting diodes. The (Ca1-x-y,Sr-x,Eu-y)(7)(SiO3)(6)Cl-2 exhibits a large Stokes shift, efficiently converting violet excitation light to yellow luminescence, and phosphors based on this host material have much less blue absorption than other phosphors. We used crystal structure analysis to determine the origin of the desired luminescence, and we used (Ca1-x-y,Sr-x,Eu-y)(7)(SiO3)(6)Cl-2 and a blue-emitting phosphor in combination with a violet chip to fabricate glareless white light-emitting diodes that have large emission areas and are suitable for general illumination.