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Photoluminescence characteristics and energy transfer between Bi~(3+) and Eu~(3+) in Na_2O–CaO–GeO_2–SiO_2 glass 下载免费PDF全文
We report the photoluminescence(PL) of Eu^3+-doped glass with Bi^3+as a sensitizer. The specific glass system with the strong enhancement of the red emission of Eu3+is obtained by adding a small number of Bi3+ions instead of increasing the Eu^3+ concentration. The emission band of Bi3+overlaps with the excitation band of Eu^3+ and the lifetime decay curves,resulting in a very efficient energy transfer from Bi^3+ to Eu^3+. The probability of energy transfer is strongly dependent on Bi^3+ concentration. In addition, the intensity of 4f–4f transition is much stronger than that of a charge-transfer(CT) band in the excitation spectrum, which indicates that the Na2O–Ca O–Ge O2-Si O2 glass is a suitable red-emitting phosphor with high stability as a candidate for light-emitting diodes(LEDs). 相似文献
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本文研究了一类半线性分数Laplacian方程{(-△)~su=f(x,u),x∈Ω, u=0,x∈R~n\Ω在原点附近无穷多解的存在性问题.利用改进的Clark's定理,获得了方程对应的泛函有收敛于零的临界点序列的结果,推广了关于整数阶半线性方程多解的存在性结果. 相似文献
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