Crystal structure and photoluminescence properties of garnet−type as−synthesized and aged Li7La3−xZr2O12:xTb phosphors. Issue 8 (1st June 2020)

• Record Type: Journal Article
• Authors: Park, K.; Kim, D.H.; Hakeem, D.A.; Jung, G.W.; Kim, S.W.
• Is Part Of: Ceramics international. Volume 46:Issue 8(2020)Part A
• Page Start: 10194
• Page End: 10202
• Publication Date: 2020-06-01
• Subjects: Powders: solid state reaction -- Calcination -- Aged phosphor -- Mixing -- Optical properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.01.011
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The crystal structure and photoluminescence (PL) properties of Tb 3+ −activated garnet−type Li7 La3− x Zr2 O12 garnet phosphors are reported. As−synthesized Li7 La3− x Zr2 O12 : x Tb (0.02 ≤ x ≤ 0.10) phosphors form a tetragonal crystal structure and emit efficient green light due to the 5 D4 → 7 F5 transition of Tb 3+ . On the other hand, aged Li7 La3− x Zr2 O12 : x Tb phosphors form mixed tetragonal and cubic crystal structures and contain a small amount of Li2 CO3 . The aged LLZO: x Tb phosphors are brownish due to the oxidation of Tb 3+ to Tb 4+ . The Tb 4+ ions act as quenching sites for Tb 3+ green emission owing to their strong absorption in UV–visible region. The aging significantly degrades emission intensities and color quality due to the presence of Tb 4+ and Li2 CO3 .