Crystal structure and photoluminescence properties of garnet−type as−synthesized and aged Li7La3−xZr2O12:xTb phosphors

K. Park; D. H. Kim; D. A. Hakeem; G. W. Jung; S. W. Kim

doi:10.1016/j.ceramint.2020.01.011

Crystal structure and photoluminescence properties of garnet−type as−synthesized and aged Li₇La_3−xZr₂O₁₂:xTb phosphors

K. Park, D. H. Kim, D. A. Hakeem, G. W. Jung, S. W. Kim

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

The crystal structure and photoluminescence (PL) properties of Tb³⁺−activated garnet−type Li₇La_3−xZr₂O₁₂ garnet phosphors are reported. As−synthesized Li₇La_3−xZr₂O₁₂:xTb (0.02 ≤ x ≤ 0.10) phosphors form a tetragonal crystal structure and emit efficient green light due to the ⁵D₄ → ⁷F₅ transition of Tb³⁺. On the other hand, aged Li₇La_3−xZr₂O₁₂:xTb phosphors form mixed tetragonal and cubic crystal structures and contain a small amount of Li₂CO₃. The aged LLZO:xTb phosphors are brownish due to the oxidation of Tb³⁺ to Tb⁴⁺. The Tb⁴⁺ ions act as quenching sites for Tb³⁺ 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 Tb⁴⁺ and Li₂CO₃.

Original language	English
Pages (from-to)	10194-10202
Number of pages	9
Journal	Ceramics International
Volume	46
Issue number	8
DOIs	https://doi.org/10.1016/j.ceramint.2020.01.011
Publication status	Published - 2020 Jun 1
Externally published	Yes

Keywords

Aged phosphor
Calcination
Mixing
Optical properties
Powders: solid state reaction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/j.ceramint.2020.01.011

Cite this

@article{0cd5eff61ff447e39468466ac8555233,

title = "Crystal structure and photoluminescence properties of garnet−type as−synthesized and aged Li7La3−xZr2O12:xTb phosphors",

abstract = "The crystal structure and photoluminescence (PL) properties of Tb3+−activated garnet−type Li7La3−xZr2O12 garnet phosphors are reported. As−synthesized Li7La3−xZr2O12:xTb (0.02 ≤ x ≤ 0.10) phosphors form a tetragonal crystal structure and emit efficient green light due to the 5D4 → 7F5 transition of Tb3+. On the other hand, aged Li7La3−xZr2O12:xTb phosphors form mixed tetragonal and cubic crystal structures and contain a small amount of Li2CO3. The aged LLZO:xTb phosphors are brownish due to the oxidation of Tb3+ to Tb4+. The Tb4+ ions act as quenching sites for Tb3+ 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 Tb4+ and Li2CO3.",

keywords = "Aged phosphor, Calcination, Mixing, Optical properties, Powders: solid state reaction",

author = "K. Park and Kim, {D. H.} and Hakeem, {D. A.} and Jung, {G. W.} and Kim, {S. W.}",

note = "Funding Information: We acknowledge the financial support by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, industry & Energy (No. 20184030202260). Funding Information: We acknowledge the financial support by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, industry & Energy (No. 20184030202260 ). Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd and Techna Group S.r.l.",

year = "2020",

month = jun,

day = "1",

doi = "10.1016/j.ceramint.2020.01.011",

language = "English",

volume = "46",

pages = "10194--10202",

journal = "Ceramics International",

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TY - JOUR

T1 - Crystal structure and photoluminescence properties of garnet−type as−synthesized and aged Li7La3−xZr2O12:xTb phosphors

AU - Park, K.

AU - Kim, D. H.

AU - Hakeem, D. A.

AU - Jung, G. W.

AU - Kim, S. W.

N1 - Funding Information: We acknowledge the financial support by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, industry & Energy (No. 20184030202260). Funding Information: We acknowledge the financial support by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, industry & Energy (No. 20184030202260 ). Publisher Copyright: © 2020 Elsevier Ltd and Techna Group S.r.l.

PY - 2020/6/1

Y1 - 2020/6/1

N2 - The crystal structure and photoluminescence (PL) properties of Tb3+−activated garnet−type Li7La3−xZr2O12 garnet phosphors are reported. As−synthesized Li7La3−xZr2O12:xTb (0.02 ≤ x ≤ 0.10) phosphors form a tetragonal crystal structure and emit efficient green light due to the 5D4 → 7F5 transition of Tb3+. On the other hand, aged Li7La3−xZr2O12:xTb phosphors form mixed tetragonal and cubic crystal structures and contain a small amount of Li2CO3. The aged LLZO:xTb phosphors are brownish due to the oxidation of Tb3+ to Tb4+. The Tb4+ ions act as quenching sites for Tb3+ 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 Tb4+ and Li2CO3.

AB - The crystal structure and photoluminescence (PL) properties of Tb3+−activated garnet−type Li7La3−xZr2O12 garnet phosphors are reported. As−synthesized Li7La3−xZr2O12:xTb (0.02 ≤ x ≤ 0.10) phosphors form a tetragonal crystal structure and emit efficient green light due to the 5D4 → 7F5 transition of Tb3+. On the other hand, aged Li7La3−xZr2O12:xTb phosphors form mixed tetragonal and cubic crystal structures and contain a small amount of Li2CO3. The aged LLZO:xTb phosphors are brownish due to the oxidation of Tb3+ to Tb4+. The Tb4+ ions act as quenching sites for Tb3+ 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 Tb4+ and Li2CO3.

KW - Aged phosphor

KW - Calcination

KW - Mixing

KW - Optical properties

KW - Powders: solid state reaction

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DO - 10.1016/j.ceramint.2020.01.011

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JO - Ceramics International

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