Abstract

SrAl₂O₄:Eu²⁺, Dy³⁺ has been widely studied as a classical persistent phosphor due to its stability and long green-afterglow duration. In this study, a series of Ce³⁺ co-doped SrAl₂O₄:Eu²⁺, Dy³⁺ phosphors were prepared by the traditional solid state reaction method, sintering under Ar + 5% H₂ atmosphere in the temperature range of 1300–1500°C. The effect of Ce³⁺ co-doping on luminescence performance of SrAl₂O₄:Eu²⁺, Dy³⁺ was investigated at Ce³⁺ concentration of 0, 0.2, 0.3 at %. Under excitation wavelengths of 365, 400 and 460 nm, respectively, the luminescence intensity was found to increase linearly with rise of sintering temperature or Ce³⁺ doping concentrations. It was ascribed to the sufficient crystallization at high sintering temperature as well as the high absorption cross section of Ce³⁺ ion. Besides, the Ce³⁺ co-doping speeds up the afterglow time without introducing the emission wavelength shift. Therefore, Ce³⁺ co-doped SrAl₂O₄: Eu, Dy is a promising high efficient phosphor for compensated the dark period in alternating current driven light-emitting diodes (AC-LED) lighting.

中文翻译：

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Ce3+ 对用于交流驱动发光二极管的 SrAl2O4:Eu2+、Dy3+ 持久性荧光粉发光特性的影响

摘要

SrAl ₂ O ₄ :Eu ²⁺ , Dy ³⁺因其稳定性和较长的绿色余辉持续时间而作为经典的持久性荧光粉被广泛研究。本研究采用传统固相反应法制备了一系列Ce ³⁺共掺杂SrAl ₂ O ₄ :Eu ²⁺ ,Dy ³⁺荧光粉，在Ar + 5% H ₂气氛下烧结，温度范围为1300–1500°C。Ce ³⁺共掺杂对SrAl ₂ O ₄ :Eu ²⁺ , Dy ³⁺发光性能的影响³⁺浓度为 0、0.2、0.3 at %。在分别为365、400和460 nm的激发波长下，发现发光强度随着烧结温度或Ce ³⁺掺杂浓度的升高呈线性增加。这归因于高烧结温度下充分的结晶以及Ce ³⁺离子的高吸收截面。此外，Ce ³⁺共掺杂在不引入发射波长偏移的情况下加快了余辉时间。因此，Ce ³⁺共掺杂的SrAl ₂ O ₄ : Eu, Dy是一种很有前途的高效荧光粉，可用于补偿交流驱动发光二极管（AC-LED）照明中的暗期。