Preparation of long-afterglow Sr4Al14O25-based luminescent material and its optical properties
2001; Elsevier BV; Volume: 51; Issue: 1 Linguagem: Inglês
10.1016/s0167-577x(01)00257-9
ISSN1873-4979
AutoresYuanhua Lin, Zilong Tang, Zhongtai Zhang,
Tópico(s)Lanthanide and Transition Metal Complexes
ResumoSr4Al14O25–Eu,Dy photoluminescent material with high brightness and long afterglow was prepared by sintering at high-temperature and weak-reducing atmosphere. The luminescent properties of Sr4Al14O25-based luminescent materials have been studied systematically. The analytical results indicated that the emission spectra of Sr4Al14O25–Eu,Dy are similar to that of Sr4Al14O25–Eu. Both of them have two main peaks near 424 and 486 nm, respectively, which are ascribed to two types of Eu2+ that existed in the Sr4Al14O25 matrix crystal. However, the Sr4Al14O25–Eu phosphor does not have the long-afterglow phenomenon; the Sr4Al14O25–Eu,Dy showed the obvious long afterglow. As for the mechanism of the long afterglow of this phosphor, Dy3+ acted as the trap level and captured the free holes in the system. It is the trapped–detrapped recombination process that resulted in the long-afterglow phenomenon of this phosphor.
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