Long lasting phosphorescence properties and multi-peak fitting on thermoluminescence of red LaAlO₃:Eu³⁺ phosphor

Abstract

Red long lasting phosphorescence(LLP) was firstly observed in LaAlO3:Eu³⁺ phosphor synthesized by solid state method at 1773 K. It reveals that the Eu³⁺ ions occupy the asymmetric La³⁺ sites, resulting in the orange-red emission of Eu³⁺. The LLP of the optimum LaAlO3:0.6%Eu³⁺ sample can come to about 2000 s according to a definition of 0.32 mcd/m². The LLP decay curve can not be fitted even by a function of three exponential terms, due to the complicated retrapping process of carriers. The result of a classical multi-peak fitting method on thermoluminescence reveals that the excellent LLP performance of LaAlO₃:Eu³⁺ material originates from the rich distribution of shallow traps(E=0.7875 eV).

Keywords

LaAlO₃:Eu³⁺ / Long lasting phosphorescence / Luminescence

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