Studies On The Energy Transfer And VUV Excited Luminescent Properties Of Pr³⁺, Eu³⁺or Tb³⁺ Doped GdPO₄

In order to meet the development of plasma display and mercury fluorescent lamp technology, exploring new vacuum ultraviolet excited quantum cutting materials become an efficient new way to study luminescent material. In addition, the development of VUV synchrotron radiation and other experimental means provides an experimental basis to study high-energy excited states of rare earth ions. In this paper we take GdPO4 as a host and study the luminescent properties of a variety of rare earth ions which excited by the synchrotron radiation light source, and analyse their spectra in detail from the perspective of energy transfer and quantum cutting.This thesis is divided into the following sections:1. Several phosphate compounds doped with Pr3+, Gd3+ or Eu3+ were prepared by hydrothermal method. The excitation characteristics of absorption band in the vacuum ultraviolet region, including the 4f5d of Pr3+ and charge transfer band of O2-and Eu3+ were studied. The results showed that 4f-5d absorption band of Pr3+ ion was in the range between 170 nm and 220 nm in GdPO4 and charge transfer band of O2-and Eu3+ was in the range between 200nm and 270nm.The internal energy transfer processes in the Pr3+-Gd3+-Eu3+ system showed the mechanism of luminescence of the three elements by analyzing their emission spectra respectively. The results showed Pr3+ could sensitized Gd3+ efficiently, and put almost all of its energy transfer to Gd3+; while Gd3+ could transfer most of its energy to Eu3+. Eu3+ emitted several peaks with the main peak of 590nm,610nm, 650nm,700nm by downward transition from 5D0 states.2. Several phosphate compounds doped with Tb3+ were synthesized by high temperature solid state reaction. The excitation and emission spectra were compared between the GdPO4 and other phosphate compounds doped Tb3+. The luminescence mechanism of Tb3+ was discussed in detail in the matrix of GdPO4...