Tunable Luminescent Properties and Concentration-Dependent, Site-Preferable Distribution of Eu2+ Ions in Silicate Glass for White LEDs Applications
Tunable Luminescent Properties and Concentration-Dependent, Site-Preferable Distribution of Eu2+ Ions in Silicate Glass for White LEDs Applications
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用于白光 LED 应用的硅酸盐玻璃中 Eu2 离子的可调发光特性和浓度依赖性、位点优选分布
DOI：
10.1021/acsami.5b02550
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发表时间：
2015-05-13
影响因子：
9.5
通讯作者：
Wu, Mingmei
中科院分区：
文献类型：
--
作者：
Zhang, Xuejie;Wang, Jing;Wu, Mingmei
在先进的光学应用领域中，具有广泛和连续可调谐的激发和发射的发光材料的设计仍然是一个挑战。本文报道了一种Eu ~（2+）掺杂的SiO_2-Li_2 O-SrO-Al_2O_3-K_2 O-P_2 O_5（简称SLSAKP：Eu ~（2+））硅酸盐发光玻璃。有趣的是，它可以给出一个强烈的可调谐发射从青色（474 nm）到黄绿色（538 nm）简单地通过改变激发波长和调整浓度的Eu 2+离子。吸收光谱、光致发光（PLE）和发射光谱以及衰减曲线表明，在SLSAKP玻璃中存在丰富的、可区分的局域阳离子位，Eu 2+离子在不同浓度下表现出较好的位分布，这为设计Eu 2+离子的局域位环境提供了可能。将合成的玻璃与385 nm n-UV LED或450 nm蓝光LED芯片相结合，成功制备了基于发光玻璃的彩色和白色LED器件，展示了发光玻璃在未来先进固态照明领域的潜在应用前景。
The design of luminescent materials with widely and continuously tunable excitation and emission is still a challenge in the field of advanced optical applications. In this paper, we reported a Eu2+-doped SiO2-Li2O-SrO-Al2O3-K2O-P2O5 (abbreviated as SLSAKP:Eu2+) silicate luminescent glass. Interestingly, it can give an intense tunable emission from cyan (474 nm) to yellowish-green (538 nm) simply by changing excitation wavelength and adjusting the concentration of Eu2+ ions. The absorption spectra, photoluminescence excitation (PLE) and emission (PL) spectra, and decay curves reveal that there are rich and distinguishable local cation sites in SLSAKP glasses and that Eu2+ ions show preferable site distribution at different concentrations, which offer the possibility to engineer the local site environment available for Eu2+ ions. Luminescent glasses based color and white LED devices were successfully fabricated by combining the as-synthesized glass and a 385 nm n-UV LED or 450 nm blue LED chip, which demonstrates the potential application of the site engineering of luminescent glasses in advanced solid-state lighting in the future.