碘化铯晶体中Ph^(2+)基聚集相的发光性质

Luminescence Properties of Pb^(2+)-Based Aggregates in CsI Host Crystals

掺铅的碘化铯（Pb：CsI）晶体在400℃空气中进行热处理可以在晶体中诱导产生发光中心，这些发光中心的激发谱与CS－Pb-I体系中一系列化合物的激子吸收谱相吻合．它们被认为是由该晶体在退火过程中所形成的CsPbI3、Cs4PbI6等聚集相产生的．测量了10～30K温度范围内分别在410nm和360nm波长激发下Ph：CsI的发射谱，观察到各发射谱的相对强度随退火时间而变化，这表明在400℃退火温度下晶体中各类Cs－Ph－I聚集相的形成和转化已十分活跃．

Luminescence centers were created in the CsI host crystals by annealing of Pb-doped crystals at 400℃ in air. It was found that the excitation spectra of these luminescence centers are coincided well with the excitation absorption of a series of compounds in the Cs-Pb-I system,which indicates that they are attributed to the creation of CsPbI3, CsPbI6 and other aggregates in the annealing process. The emission spectra of Pb:CsI crystals were measured in the 10~30K temperature range by 360nm and 410nm excitation respectively The relative intensities of emission bands depend strongly on annealing time, which implies that the creation and transformation of various Pb-based aggregates in Pb:CsI crystals tend to active around 400℃ annealing temperature.