Highly efficient white-light-emitting diodes fabricated with short-wavelength yellow oxynitride phosphors
Highly efficient white-light-emitting diodes fabricated with short-wavelength yellow oxynitride phosphors
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DOI：
10.1063/1.2182067
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发表时间：
2006-03
影响因子：
4
通讯作者：
R. Xie;N. Hirosaki;M. Mitomo;Kōsei Takahashi;K. Sakuma
中科院分区：
文献类型：
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作者：
R. Xie;N. Hirosaki;M. Mitomo;Kōsei Takahashi;K. Sakuma
我们已经报道了橙黄色的Ca-α-SiAlON：Eu ~（2+）荧光粉，并将其用于制备暖白色发光二极管（LED）。在这封信中，我们报告了绿黄色的Li-α-SiAlON：Eu 2+荧光粉，并使用它们与InGaN蓝色LED芯片（460 nm）耦合时产生日光。新发现的Li-α-SiAlON：Eu 2+荧光粉在460 nm激发下发射573- 577 nm的较短波长，并且表现出比Ca-α-SiAlON：Eu 2+更小的斯托克斯位移。通过使用这种短波长黄色氧氮化物磷光体，可以从白色LED产生明亮的日光发射。因此，利用α-SiAlON：Eu 2+荧光粉可以制备出具有可调白色光的高效白色LED，使其能够应用于更广泛的领域。
We have already reported orangish yellow Ca–α-SiAlON:Eu2+ phosphors, and applied them to fabricate warm white light-emitting diodes (LEDs). In this letter, we report on greenish yellow Li–α-SiAlON:Eu2+ phosphors, and use them to create daylight when coupled to an InGaN blue LED chip (460nm). The newly discovered Li–α-SiAlON:Eu2+ phosphors emit at shorter wavelengths of 573–577nm under the 460nm excitation, and exhibit a smaller Stokes shift than Ca–α-SiAlON:Eu2+ does. By using this short-wavelength yellow oxynitride phosphor, bright daylight emissions from white LEDs can be generated. Thus, highly efficient white LEDs with tunable white light can be fabricated with α-SiAlON:Eu2+ phosphors, enabling them for a wider range of applications.