闪烁体Y<SUB>2</SUB>SiO<SUB>5</SUB>∶Ce的发光特性

doi:10.3964/j.issn.1000-0593(2016)08-2399-06

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Abstract Cerium doped Y₂SiO₅ (YSO) is an important scintillator material due to its high density, non-hygroscopic, excellent light output and fast decay time nature. in the paper, Y₂SiO₅∶Ce³⁺0.2%(YSO∶Ce) was grown with high-temperature solid-phase method. The time-resolved excitation and emission spectra and fluorescent decay curves at low temperature and room temperature (RT) were measured and discussed. There were two types of luminescence, one was the crystal defect emission, the center at 320 nm; the other one was doped Ce³⁺ ions 5d→4f emission, the center at 440 nm. Only when the excitation energy (E_x) was greater than the band gap width (E_g), the crystal defect emission can be observed corresponding to slow process, and the emission intensity was higher at low temperature. The crystals defect emission was hardly observed in the time-resolved emission spectra when the temperature rose to room temperature because of temperature quenching. Regions from 60~300 nm corresponding to emission due to 5d→4f transitions in the activator Ce³⁺ ions peaks at 440 nm, a plurality of excitation peaks were observed. Among them, the excitation with energy less than 6.1 eV(E_x<E_g) was the direct excitation band belonging to the 5d energy level of Ce³⁺ ions. The corresponding excitation emission was fast process. Two emission peaks centering at 392 and 426 nm were observed at low temperature, corresponding to the Ce³⁺ ion electron transition from the lowest 5d level to the two spin-orbit 4f ground state of Ce³⁺(²F_5/2, ²F_7/2). With increasing temperature the doublet was thermalized and at RT the emission peak separation cannot be observed. At 200 and 300 K, when the excitation energy (E_x) was greater than the band gap width (E_g), decay curve had obvious rising edge, which shows that some energy is transmitted to Ce³⁺ ions.

Key words：Scintillator;Ce³⁺ emission;Y₂SiO₅;Emission spectra;Excitation spectra;Spectral characteristic

Received: 2015-12-26 Accepted: 2016-03-18

ZTFLH:

O462

Corresponding Authors: DING Xi-feng E-mail: syzxding2008@ysu.edu.cn

Cite this article:

WANG Wen-jing,DING Xi-feng,SUN Xin, et al. Luminescence Characteristics of Scintillator Y₂SiO₅∶Ce[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(08): 2399-2404.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2016)08-2399-06 OR https://www.gpxygpfx.com/EN/Y2016/V36/I08/2399