用光学多道分析器和微机控制线性升温法研究了MgSO4:Dy 和MgSO4:Dy，Mn热释光材料的发光光谱。测定不同温度和波长的发光光谱，得到了热释光三维光谱图。观察到MgSO4掺入稀土元素Dy的两个发光谱带为480nm和580nm,每个光谱带有多个发光峰。与掺入Dy的CaSO4的三维发光谱相比较,掺入稀土元素Dy的热释光材料的发光谱带的波长主要取决于掺入Dy3+的能级间的跃迁。MgSO4同时掺入Dy和Mn后,480nm发光谱带受到很大的抑制,所有发光峰的发光效率显著减小；波长为580nm谱带的多个发光峰中,温度低于300℃的发光峰的发光效率显著减小,在380℃附近的发光峰的发光强度最大。这说明掺入Mn杂质后,不同深度的陷阱的相对分布发生了变化。%Emission spectra of phosphor MgSO4 doped with Dy and Dy/Mn were measured with an optical multichannel analyzer and a linear heating system whose temperature was controlled by a microcomputer. The emission spectrum bands at 480 nm and 580 nm of phosphor MgSO4 doped with Dy were observed in the three dimensional (3D) glow curves. Compared with the 3D spectrum of CaSO4:Dy and the spectrum bands of MgSO4:Dy shows the same wavelengths which resulted from the quantum transitions among the energy levels of Dy3+ ions. The intensities of the glow peaks in both spectrum bands (480nm and 580nm) of phosphor MgSO4 doped with Dy/Mn were dramatically reduced except the 380℃ glow peak.
展开▼
