Learning from a Mineral Structure toward an Ultra-Narrow-Band Blue-Emitting Silicate Phosphor RbNa3(Li3SiO4)4:Eu2+
Learning from a Mineral Structure toward an Ultra-Narrow-Band Blue-Emitting Silicate Phosphor RbNa3(Li3SiO4)4:Eu2+
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DOI：
10.1002/anie.201807087
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发表时间：
2018-09-03
影响因子：
16.6
通讯作者：
Xia, Zhiguo
中科院分区：
文献类型：
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作者：
Liao, Hongxu;Zhao, Ming;Xia, Zhiguo
从天然矿物结构中学习是开发用于磷光体转换（pc）LED的潜在基质晶格的有效方式。从UCr_4C_4型矿物模型出发，合成了一种硅酸盐窄带蓝色荧光粉RbNa_3（Li_3SiO_4）（4）：Eu ~（2+）（RNLSO：Eu ~（2+））。宽的激发光谱（320- 440 nm）表明该荧光粉可以很好地与近紫外（n-UV）LED芯片匹配。由于UCr 4C 4型的高度凝聚和刚性骨架，RNLSO：Eu 2+表现出非常小的斯托克斯位移和前所未有的超窄（半峰全宽，FWHM=22.4nm）蓝色发射带（λ（em）= 471 nm）以及优异的热稳定性（在25 ° C下的初始积分强度的96%@150 ° C）。对于来自n-UV LED芯片和窄带RNLSO：Eu 2+（蓝色）、β-SiAlON：Eu 2+（绿色）和K2 SiF 6：Mn 4+（红色）组件作为RGB发射器的原型设计的液晶显示器中的应用，所制造的（pc）LED的色域为75%。
Learning from natural mineral structures is an efficient way to develop potential host lattices for applications in phosphor converted (pc)LEDs. A narrow-band blue-emitting silicate phosphor, RbNa3(Li3SiO4)(4):Eu2+ (RNLSO:Eu2+), was derived from the UCr4C4-type mineral model. The broad excitation spectrum (320-440nm) indicates this phosphor can be well matched with the near ultraviolet (n-UV) LED chip. Owing to the UCr4C4-type highly condensed and rigid framework, RNLSO:Eu2+ exhibits an extremely small Stokes shift and an unprecedented ultra-narrow (full-width at half-maximum, FWHM=22.4nm) blue emission band (lambda(em)=471nm) as well as excellent thermal stability (96%@150 degrees C of the initial integrated intensity at 25 degrees C). The color gamut of the as-fabricated (pc)LEDs is 75% NTSC for the application in liquid crystal displays from the prototype design of an n-UV LED chip and the narrow-band RNLSO:Eu2+ (blue), beta-SiAlON:Eu2+(green), and K2SiF6:Mn4+ (red) components as RGB emitters.