Crystal Structure Refinement and Persistent Luminescence Properties                         of                             Lu3Al5-xGaxO12:Ce3+, Cr3+                         Phosphors

Jiwon Kim; Young Jin Kim

doi:10.3740/MRSK.2020.30.8.413

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2020 Vol.30, Issue 8 Preview Page Next Page

Crystal Structure Refinement and Persistent Luminescence Properties of Lu₃Al_5-xGa_xO₁₂:Ce³⁺,Cr³⁺ Phosphors Lu₃Al_5-xGa_xO₁₂:Ce³⁺,Cr³⁺ 형광체의 결정구조 분석 및 잔광성 발광 특성

August 2020. pp. 413-420

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Abstract

Lu₃Al_5-xGa_xO₁₂:Ce³⁺,Cr³⁺ powders are prepared using a solid-state reaction method. To determine the crystal structure, Rietveld refinement is performed. The results indicate that Ga³⁺ ions preferentially occupied tetrahedral rather than octahedral sites. The lattice constant linearly increases, obeying Vegard’s law, despite the strong preference of Ga³⁺ for the tetrahedral sites. Increasing x led to a blue-shift of the Ce³⁺ emission band in the green region and a change in the emission intensity. Persistent luminescence is observed from the powders prepared with x = 2–3, occurring through a trapping and detrapping process between Ce³⁺ and Cr³⁺ ions. The longest persistent luminescence is achieved for x = 2; its lifetime is at least 30 min. The findings are explained using crystal structure refinement, crystal field splitting, optical band gap, and electron trapping mechanism.

Keywords

Lu₃Al5O₁₂

garnet

persistent luminescence

afterglow

phosphor

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 30
No :8
Pages :413-420
Received Date : 2020-07-01
Revised Date : 2020-07-23
Accepted Date : 2020-07-25
DOI :https://doi.org/10.3740/MRSK.2020.30.8.413

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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