Melilite-Structure CaYAl3O7:Eu3+ Phosphor: Structural and Optical Characteristics for Near-UV LED-Based White Light
Melilite-Structure CaYAl3O7:Eu3+ Phosphor: Structural and Optical Characteristics for Near-UV LED-Based White Light
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DOI：
10.1021/jp307192y
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发表时间：
2012-12-27
影响因子：
3.7
通讯作者：
Im, Won Bin
中科院分区：
文献类型：
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作者：
Park, Seung Hyok;Lee, Kyoung Hwa;Im, Won Bin
采用固相反应法制备了红色荧光粉CaY1-xEuxAl3O7(CyA：Eu3+)，并用Rietveld精修法和X射线源最大熵法对其结构进行了研究。X射线衍射谱证实了该荧光粉为四方相。研究了样品的光致发光特性，并将其应用于白光发光二极管(WLED)。由于Eu3+离子的D-5(0)->；F-7(2)电偶极跃迁，其发射光谱主要由位于616 nm的红峰主导。当Eu3+浓度约为0.35时，发生浓度猝灭，并计算了荧光粉的临界转移距离。讨论了一种用蓝、绿和CyA：Eu3+红色荧光粉在紫外光LED(最大波长=396 nm)中掺入封装剂制成的白光LED。
A red-emitting phosphor, CaY1-xEuxAl3O7 (CYA:Eu3+), was prepared by conventional solid-state reaction, and its structural properties were investigated by means of Rietveld refinement method and maximum entropy method using an X-ray source. XRD patterns confirm the tetragonal phase of CYA:Eu3+ phosphors. The photoluminescence properties of the samples were investigated for application to white light-emitting diodes (WLEDs). The emission spectrum is dominated by a red peak located at 616 nm due to the D-5(0) -> F-7(2) electric dipole transition of Eu3+ ions. Concentration quenching occurs when the Eu3+ concentration is about 0.35 and the critical transfer distance of the phosphor is also calculated. A white LED fabricated with blue, green, and CYA:Eu3+ red phosphor incorporated with an encapsulant in ultraviolet LEDs (lambda(max) = 396 nm) is discussed.