Preparation and spectroscopic properties of La2Hf 2O7/Tb

Ya Ming Ji; Dan Yu Jiang; Jian Lin Shi

doi:10.1016/j.matlet.2004.11.033

Preparation and spectroscopic properties of La₂Hf ₂O₇/Tb

Ya Ming Ji, Dan Yu Jiang, Jian Lin Shi

Chinese Academy of Sciences

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

36 Scopus citations

Abstract

Poorly crystallized La₂Hf₂O₇ powders doped with different Tb concentrations were directly synthesized through a combustion process, using glycine as a fuel. Single-phase and well-crystallized cubic pyrochlore La₂Hf₂O₇:Tb phosphors were obtained after calcinations at 1500 °C. The combustion-made powders could be easily sintered to transparent ceramic La₂Hf₂O₇:Tb in H₂ atmosphere at 1900 °C. The PL excitation and emission spectra were recorded for both types of the materials. Emission spectra of both type of the materials were found to be typical for Tb³⁺, resulting from radiative relaxation of ⁵D₃ and ⁵D₄ levels, and the integrated emission intensity ratio of ⁵D₃ to ⁵D₄ decreases with the increase of Tb³⁺ concentration due to the cross-relaxation between Tb³⁺ ions. The excitation spectra revealed that the energy absorbed by the photoionization of Tb³⁺ can be transferred to the dopant much more efficiently in the transparent ceramic La₂Hf₂O₇:Tb than in powders.

Original language	English
Pages (from-to)	868-871
Number of pages	4
Journal	Materials Letters
Volume	59
Issue number	8-9
DOIs	https://doi.org/10.1016/j.matlet.2004.11.033
State	Published - Apr 2005
Externally published	Yes

Keywords

Combustion synthesis
LaHfO
Spectroscopic properties
Tb
Transparent ceramics

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10.1016/j.matlet.2004.11.033

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@article{37c5d7bd044042d29d86ac97ab25dea4,

title = "Preparation and spectroscopic properties of La2Hf 2O7/Tb",

abstract = "Poorly crystallized La2Hf2O7 powders doped with different Tb concentrations were directly synthesized through a combustion process, using glycine as a fuel. Single-phase and well-crystallized cubic pyrochlore La2Hf2O7:Tb phosphors were obtained after calcinations at 1500 °C. The combustion-made powders could be easily sintered to transparent ceramic La2Hf2O7:Tb in H2 atmosphere at 1900 °C. The PL excitation and emission spectra were recorded for both types of the materials. Emission spectra of both type of the materials were found to be typical for Tb3+, resulting from radiative relaxation of 5D3 and 5D4 levels, and the integrated emission intensity ratio of 5D3 to 5D4 decreases with the increase of Tb3+ concentration due to the cross-relaxation between Tb3+ ions. The excitation spectra revealed that the energy absorbed by the photoionization of Tb3+ can be transferred to the dopant much more efficiently in the transparent ceramic La2Hf2O7:Tb than in powders.",

keywords = "Combustion synthesis, LaHfO, Spectroscopic properties, Tb, Transparent ceramics",

author = "Ji, \{Ya Ming\} and Jiang, \{Dan Yu\} and Shi, \{Jian Lin\}",

year = "2005",

month = apr,

doi = "10.1016/j.matlet.2004.11.033",

language = "英语",

volume = "59",

pages = "868--871",

journal = "Materials Letters",

issn = "0167-577X",

publisher = "Elsevier B.V.",

number = "8-9",

}

TY - JOUR

T1 - Preparation and spectroscopic properties of La2Hf 2O7/Tb

AU - Ji, Ya Ming

AU - Jiang, Dan Yu

AU - Shi, Jian Lin

PY - 2005/4

Y1 - 2005/4

N2 - Poorly crystallized La2Hf2O7 powders doped with different Tb concentrations were directly synthesized through a combustion process, using glycine as a fuel. Single-phase and well-crystallized cubic pyrochlore La2Hf2O7:Tb phosphors were obtained after calcinations at 1500 °C. The combustion-made powders could be easily sintered to transparent ceramic La2Hf2O7:Tb in H2 atmosphere at 1900 °C. The PL excitation and emission spectra were recorded for both types of the materials. Emission spectra of both type of the materials were found to be typical for Tb3+, resulting from radiative relaxation of 5D3 and 5D4 levels, and the integrated emission intensity ratio of 5D3 to 5D4 decreases with the increase of Tb3+ concentration due to the cross-relaxation between Tb3+ ions. The excitation spectra revealed that the energy absorbed by the photoionization of Tb3+ can be transferred to the dopant much more efficiently in the transparent ceramic La2Hf2O7:Tb than in powders.

AB - Poorly crystallized La2Hf2O7 powders doped with different Tb concentrations were directly synthesized through a combustion process, using glycine as a fuel. Single-phase and well-crystallized cubic pyrochlore La2Hf2O7:Tb phosphors were obtained after calcinations at 1500 °C. The combustion-made powders could be easily sintered to transparent ceramic La2Hf2O7:Tb in H2 atmosphere at 1900 °C. The PL excitation and emission spectra were recorded for both types of the materials. Emission spectra of both type of the materials were found to be typical for Tb3+, resulting from radiative relaxation of 5D3 and 5D4 levels, and the integrated emission intensity ratio of 5D3 to 5D4 decreases with the increase of Tb3+ concentration due to the cross-relaxation between Tb3+ ions. The excitation spectra revealed that the energy absorbed by the photoionization of Tb3+ can be transferred to the dopant much more efficiently in the transparent ceramic La2Hf2O7:Tb than in powders.

KW - Combustion synthesis

KW - LaHfO

KW - Spectroscopic properties

KW - Tb

KW - Transparent ceramics

UR - https://www.scopus.com/pages/publications/13444256337

U2 - 10.1016/j.matlet.2004.11.033

DO - 10.1016/j.matlet.2004.11.033

M3 - 文章

AN - SCOPUS:13444256337

SN - 0167-577X

VL - 59

SP - 868

EP - 871

JO - Materials Letters

JF - Materials Letters

IS - 8-9

ER -

Preparation and spectroscopic properties of La₂Hf ₂O₇/Tb

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Keywords

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