Photoluminescence profiles and fast/slow annealing effects of Eu(III)/Tb(III)-codoped silica phosphor materials

Hee Jung Yoon; Young In Choi; Jun-Gill Kang; Youngku Sohn

doi:10.1002/bio.3029

Photoluminescence profiles and fast/slow annealing effects of Eu(III)/Tb(III)-codoped silica phosphor materials

Luminescence. 2016 May;31(3):821-9. doi: 10.1002/bio.3029. Epub 2015 Sep 23.

Authors

Hee Jung Yoon¹, Young In Choi¹, Jun-Gill Kang², Youngku Sohn¹

Affiliations

¹ School of Chemistry and Biochemistry, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, South Korea.
² Department of Chemistry, Chungnam National University, Daejeon, 34134, South Korea.

PMID: 26394870
DOI: 10.1002/bio.3029

Abstract

A silica (SiO2) nanoparticle matrix was codoped with luminescent Eu(III) and Tb(III) ions using a modified Stöber method. The effects of fast and slow thermal annealing on photoluminescence profile imaging were examined. Slow annealing treatment suppressed more quenching sites than fast thermal annealing to further increase the photoluminescence signals. The photoluminescence signals observed between 450 and 720 nm were assigned to the (5)D(0) → (7)F(J) (J = 0,1,2,3,4) of Eu(III) and the (5)D(4) → (7)F(J) (J = 6,5,4,3) transitions of Tb(III). Photoluminescence was largely sensitized by indirect excitation and was much stronger than that generated by direct excitation. The Eu(III) and Tb(III) ions were doped at lower symmetry sites in the silica matrix.

Keywords: Eu(III); Tb(III); annealing; photoluminescence; silica.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Europium / chemistry*
Luminescence*
Nanoparticles / chemistry
Photochemical Processes*
Silicon Dioxide / chemistry*
Terbium / chemistry*
Time Factors

Substances

Terbium
Europium
Silicon Dioxide