Journal
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
Volume 3, Issue 12, Pages R238-R244Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0071412jss
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [26289085, 25630120]
- Grants-in-Aid for Scientific Research [13J00656, 26289085, 25630120] Funding Source: KAKEN
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We demonstrated the synthesis of Eu3+-activated Tb3Ga5O12 garnet phosphor by metal-organic deposition and reported the photoluminescence (PL) properties of this garnet phosphor in detail. The phosphors were synthesized from a mixture of organic gallium solution and acetic acid dissolved with TbCl3/Eu2O3. The X-ray diffraction analysis indicated that the synthesized phosphors were a mixture of beta-phase Ga2O3 and cubic Tb3Ga5O12 garnet (TGG). The TGG fraction increased with the increase of the TbCl3 addition in the raw solution. The Eu3+ ions were preferentially incorporated into the TGG crystallites rather than beta-Ga2O3. The intensities of the Eu3+ emissions in TGG were strongly influenced by the Cr3+ red-line emissions, where the Cr3+ ions were unintentionally introduced in the synthesized phosphors. The PL excitation spectra indicated that the Eu3+ emission at 708 nm (D-5(0) -> F-7(4)) was gained by the Tb3+ intra-f-shell, Cr3+ intra-d-shell, and charge transfer transitions. Temperature dependences of the Eu3+ and Cr3+ emission intensities were measured at T = 20 - 380 K and explained by the proposed theoretical models very well. The effects of the Eu3+ ion site in the various host materials on the luminous properties were also discussed in detail. (C) 2014 The Electrochemical Society. All rights reserved.
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