白光LED用Ce3+/Sm3+共掺玻璃和微晶玻璃的发光特性及能量传递研究

采用高温熔融法制备了一系列Ce³⁺/Sm³⁺共掺透明微晶玻璃,并研究了其发光特性。在微晶玻璃中Ce³⁺呈现出基于4f-5d跃迁的较强的宽带蓝光发射,通过调节Ce³⁺/Sm³⁺离子的掺杂浓度,Ce³⁺/Sm³⁺离子共掺微晶玻璃发光的色度逐渐发生变化,当CeO₂/Sm₂O₃掺杂的量比为1:1时,制得的微晶玻璃发光色坐标为(0.315, 0.296)。通过光谱和荧光衰减曲线,研究了Ce³⁺离子到Sm³⁺离子的能量传递,在SAZKNGC_0.6S_0.6微晶玻璃中,Ce³⁺离子向Sm³⁺离子传递能量效率约为20%。结果表明,Ce³⁺/Sm³⁺共掺微晶玻璃是白光LED的一种潜在基质材料。

Luminescence and Energy Transfer of Ce3+ / Sm3+ Co-doped Glass and Glass Ceramics Containing Zn2 SiO4 Nanocrystals for White LEDs

A series of transparent Ce 3 + / Sm 3 + co-doped glass ceramics were prepared by high temperature melting,and their luminescence properties were studied.In the glass ceramics,Ce 3 + ions have shown efficient broadband blue emission due to the 4f-5d transition,and Sm 3 + ions have shown bright orange-red luminescence resulting from the 4 G 5 /2 → 6 H J(J =5/2,7/2,9/2,11/2) transitions.By adjusting the doped concentration of Ce 3 + and Sm 3 + ions,the chroma of the samples varied gradually.When the mole fraction of CeO 2 and Sm 2 O 3 was 1∶ 1,the white light luminescence glass ceramic with the chromaticity coordinate(0.315,0.296) was prepared.The energy transfer from Ce 3 + to Sm 3 + ions were investigated by spectra properties and fluorescence decay curves,energy transfer efficiency is about 20% in the SAZKNGC 0.6 S 0.6 glass ceramics.The results indicate that Ce 3 + / Sm 3 + co-doped glass ceramics containing β-Zn 2 SiO 4 are potential matrix materials for white LEDs.