Discovery of novel solid solution Ca(3)Si(3-x) O(3+x) N(4-2x) : Eu(2+) phosphors: structural evolution and photoluminescence tuning.
Discovery of novel solid solution Ca(3)Si(3-x) O(3+x) N(4-2x) : Eu(2+) phosphors: structural evolution and photoluminescence tuning.
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新型固溶体 Ca3Si3-xO3 xN4-2x: Eu2 荧光粉的发现：结构演化和光致发光调谐
DOI：
10.1038/s41598-017-18319-5
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发表时间：
2017-12-22
影响因子：
4.6
通讯作者：
Wu X
中科院分区：
文献类型：
--
作者：
Wang B;Liu YG;Huang Z;Fang M;Wu X
新型荧光粉的发现是提高白色发光二极管显色指数(CRI)和相关色温(CCT)的主要问题之一。本论文主要研究了新型(氧氮化物)固溶体Ca3Si3−xO3+xN4−2x：Eu2+的合成、晶体结构变化和发光调谐。X射线衍射分析表明，当x值偏离最佳值(x = 1)时，晶格发生扭曲。晶格扭曲导致发射光谱展宽和斯托克斯位移(ΔSS)增加，从而导致更大的热猝灭。随着x值的减小，发射光谱从505.2 nm红移到540.8 nm，这归因于晶场分裂。增强的晶场分裂还拓宽了激发光谱，使其有可能用作近紫外光(n-UV)LED的荧光粉。用所制备的荧光粉制作了一种3-荧光粉转换的w- = 灯，具有较高的CRI值(Ra CCT85.29)和合适的CCT值(4903.35 K)。这些结果表明，Ca3Si3−xO3+xN4−2x：Eu2+荧光粉可以作为n-UV w-LED的绿色荧光粉，通过控制晶体结构和形貌可以实现光谱可调。
Discovery of novel phosphors is one of the main issues for improving the color rendering index (CRI) and correlated color temperature (CCT) of white light-emitting diodes (w-LEDs). This study mainly presents a systematic research on the synthesis, crystal structure variation and photoluminescence tuning of novel (oxy)nitride solid solution Ca3Si3−xO3+xN4−2x: Eu2+ phosphors. XRD refinements show that lattice distortion occurs when x value diverges the optimum one (x = 1). The lattice distortion causes a widening of emission spectrum and an increase of Stokes shift (ΔSS), which leads to a bigger thermal quenching. With decrease of x value, the emission spectrum shows an obvious red-shift from 505.2 to 540.8 nm, which is attributed to the crystal field splitting. The enhanced crystal field splitting also broadens the excitation spectrum, making it possible to serve as the phosphor for near ultraviolet (n-UV) LEDs. A 3-phosphor-conversion w-LED lamp was fabricated with the as-prepared phosphor, which exhibits high CRI (Ra = 85.29) and suitable CCT (4903.35 K). All these results indicate that the Ca3Si3−xO3+xN4−2x: Eu2+ phosphor can serve as the green phosphor for n-UV w-LEDs, with a tunable spectrum by controlling the crystal structure and morphology.
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影响因子：
35
作者：
Pimputkar, Siddha;Speck, James S.;Nakamura, Shuji
通讯作者：
Nakamura, Shuji
影响因子：
0.9
作者：
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通讯作者：
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影响因子：
3.8
作者：
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影响因子：
8.6
作者：
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影响因子：
8.6
作者：
Li, YQ;Delsing, ACA;Hintzen, HT
通讯作者：
Hintzen, HT