Y_2O_2S:Eu,Ti,Mg的光谱性质和长时发光特性

Spectral Properties and Long Persistence Phosphorescence of Y_2O_2S∶Eu, Ti, Mg

研究了Ti,Mg,Eu等离子掺杂的Y2O2S材料的光谱性质和长时发光特性,并发现了光致激发下Y2O2S∶Ti中峰值为594nm的宽带发射及长时发光现象。根据发射光谱和衰减曲线的分析,认为Ti掺杂后在Y2O2S晶体中形成施主能级,有效地捕获离化的电子,造成长时发光现象。共掺入Mg进行电荷补偿可增强初始发光亮度和发光时间。在红色长时发光材料Y2O2S∶Eu,Ti,Mg中,Eu3+作为发光中心,接受被俘获的电子和空穴重新复合后释放的能量,发射Eu3+的626和616nm等特征光谱。

The spectral properties and long persistence phosphorescence of titanium-magnesium- and europium-doped yttrium oxysulfide were investigated. The broad band emission with peak at 594 nm under UV excitation and long persistence phosphorescence in Y_2O_2S∶Ti were observed. From luminescent spectra and decay curve, it is believed that donor level is formed in Y_2O_2S crystal by the doping of Ti, which can effectively capture the ionized electrons and so causes long persistence phosphorescence. Co-doped Mg can increase the persistence intensity through the mechanism of charge compensation. In the red long persistence phosphor Y_2O_2S∶Eu, Ti, Mg, the trivalent europium ion acts as luminescence center, and emits the typical sharp lines at around 626 and 616 nm, when accepting the energy released from the recombination of the trapped electrons with the hole through conductivity band.