Ce<sup>3+</sup>-Yb<sup>3+</sup>共掺YAG荧光粉量子剪裁发光的浓度及温度特性

采用高温固相法制备了不同掺杂浓度的YAG∶1%Ce3+,x%Yb3+ (x=5,10,15,20,25)系列荧光粉。在450 nm蓝光激发下, 测试了样品的发射光谱, 得到了中心波长在550 nm的可见宽带发射(Ce3+: 5d→4f)和1 030 nm的近红外发射(Yb3+: 2F5/2→2F7/2)。可见和近红外发射强度随Yb3+掺杂浓度的变化表明Ce3+到Yb3+存在能量传递过程, 并得到Yb3+的猝灭浓度为15%。在低温条件下(80~300 K)测试YAG∶1%Ce3+,15%Yb3+样品的发射光谱和拉曼光谱, 通过对其量子剪裁发光温度特性的分析, 描述了基质声子在Ce3+到Yb3+的能量传递过程中起到的重要作用。

Abstract

YAG∶1%Ce3+,x%Yb3+(x=5, 10, 15, 20, 25) phosphor was synthesized via the high temperature solid state method. The optical properties of the phosphor were characterized by photoluminescence (PL). Under the excitation of 450 nm, the visible broadband emission from Ce3+: 5d→4f with the central wavelength of 550 nm was observed. The NIR emission around 1 030 nm from Yb3+: 2F5/2→2F7/2 was also observed under the same excitation. The variation of emission intensity with the concentration of Yb3+ shows that the energy transfer exists between Ce3+ and Yb3+, and the quenching concentration of Yb3+ is 15%. For YAG∶1%Ce3+,15%Yb3+ sample, the emission spectra and Raman spectra were measured at low temperature (80-300 K). Based on the analyze of temperature characteristics of quantum cutting luminescence, the results show that the phonons of the host material play an important role in the energy transfer from Ce3+ to Yb3+.

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李路, 娄朝刚, 谢宇飞. Ce³⁺-Yb³⁺共掺YAG荧光粉量子剪裁发光的浓度及温度特性[J]. 发光学报, 2016, 37(12): 1445. LI Lu, LOU Chao-gang, XIE Yu-fei. Concentration and Temperature Characteristics of Quantum Cutting Luminescence in Ce³⁺-Yb³⁺ Co-doped YAG Phosphor[J]. Chinese Journal of Luminescence, 2016, 37(12): 1445.

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