Novel rare-earth-free yellow Ca5Zn3.92In0.08(V0.99Ta0.01O4)6 phosphors for dazzling white light-emitting diodes.
Novel rare-earth-free yellow Ca5Zn3.92In0.08(V0.99Ta0.01O4)6 phosphors for dazzling white light-emitting diodes.
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DOI：
10.1038/srep10296
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发表时间：
2015-05-20
影响因子：
4.6
通讯作者：
Yu JS
中科院分区：
文献类型：
--
作者：
Pavitra E;Raju GS;Park JY;Wang L;Moon BK;Yu JS
目前市场上的白光发光二极管（WLED）产品都是基于蓝光LED结合黄色荧光粉的方法。然而，由于其低显色指数（CRI < 75）和高相关色温（CCT = 6000 K），这些wled仍然不足以用于一般照明和平板显示（FPD）应用。虽然近紫外（UV） LED芯片提供比蓝色芯片更有效的激发，但YAG:Ce3+荧光粉在近紫外光谱区域的激发非常弱。因此，对在近紫外区激发的新型黄色荧光粉材料的需求日益增加。在这项工作中，我们报道了一种新的自激活黄色Ca5Zn3.92In0.08(v0.99 ta0.0104)6 （CZIVT）荧光粉，它能有效地将近紫外激发光转化为黄色发光。通过Rietveld精化分析，阐明了这些CZIVT荧光粉的晶体结构和晶格参数。通过掺杂In3+和Ta5+离子，增强了红色区域的发射强度，控制了Stokes位移，获得了良好的显色性。当将CZIVT和商用蓝Ba0.9Eu0.1MgAl10O17荧光粉组合涂覆在近紫外LED芯片上时，可获得高显色指数82.51和低CCT 5231 K的令人满意的WLED，这对于室内照明和FPDs至关重要。
White light-emitting diode (WLED) products currently available on the market are based on the blue LED combined with yellow phosphor approach. However, these WLEDs are still insufficient for general illumination and flat panel display (FPD) applications because of their low color-rendering index (CRI < 75) and high correlated color temperature (CCT = 6000 K). Although near-ultraviolet (UV) LED chips provide more efficient excitation than blue chips, YAG:Ce3+ phosphors have very weak excitation in the near-UV spectral region. Hence, there is an increasing demand for novel yellow phosphor materials with excitation in the near-UV region. In this work, we report novel self-activated yellow Ca5Zn3.92In0.08(V0.99Ta0.01O4)6 (CZIVT) phosphors that efficiently convert near-UV excitation light into yellow luminescence. The crystal structure and lattice parameters of these CZIVT phosphors are elucidated through Rietveld refinement. Through doping with In3+ and Ta5+ ions, the emission intensity is enhanced in the red region, and the Stokes shift is controlled to obtain good color rendition. When a near-UV LED chip is coated with a combination of CZIVT and commercial blue Ba0.9Eu0.1MgAl10O17 phosphors, a pleasant WLED with a high CRI of 82.51 and a low CCT of 5231 K, which are essential for indoor illumination and FPDs, is achieved.
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影响因子：
3.6
作者：
Dhobale, A. R.;Mohapatra, M.;Godbole, S. V.
通讯作者：
Godbole, S. V.
影响因子：
3.9
作者：
Setlur, AA;Comanzo, HA;Beers, WW
通讯作者：
Beers, WW
影响因子：
35
作者：
Pimputkar, Siddha;Speck, James S.;Nakamura, Shuji
通讯作者：
Nakamura, Shuji
影响因子：
3.3
作者：
CHAKOUMAKOS, BC;ABRAHAM, MM;BOATNER, LA
通讯作者：
BOATNER, LA
影响因子：
3.9
作者：
Dwivedi, Jaya;Kumar, Pawan;Gupta, Bipin Kumar
通讯作者：
Gupta, Bipin Kumar