Investigations on energy transfer mechanism and tunable luminescent properties of Co-doped Ca9La(PO4)7:Dy3+,Eu3+ phosphors

The synthesized Ca 9 La(PO 4 ) 7 :Dy 3+ ,Eu 3+ (CLPO:Dy 3+ ,Eu 3+ ) phosphors were analyzed by phase structure, optical performance, thermal stability and lifetime. The XRD pattern indicated that both the matrix and rare earth ion-doped phosphors were pure phases, and the crystal structure was confi...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2020, Vol.126 (5), Article 378
Main Authors: Niu, Jialiang, Ding, Heping, Zhou, Wei, Zhang, Ze, Bai, Dongsheng, Wang, Xinrui
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
Condensed Matter Physics
Crystal structure
Dipoles
Dysprosium
Emission spectra
Energy transfer
Europium
Excitation spectra
Machines
Manufacturing
Materials science
Metal ions
Nanotechnology
Optical and Electronic Materials
Optical properties
Phosphors
Physics
Physics and Astronomy
Processes
Quadrupole interaction
Quadrupoles
Solid phases
Stability analysis
Surfaces and Interfaces
Synthesis
Temperature dependence
Thermal stability
Thin Films
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Summary:The synthesized Ca 9 La(PO 4 ) 7 :Dy 3+ ,Eu 3+ (CLPO:Dy 3+ ,Eu 3+ ) phosphors were analyzed by phase structure, optical performance, thermal stability and lifetime. The XRD pattern indicated that both the matrix and rare earth ion-doped phosphors were pure phases, and the crystal structure was confirmed as trigonal system. Upon 351 nm excitation, Dy 3+ -doped CLPO phosphors performed two strong emission peaks at 481 nm and 573 nm. The energy transfer phenomenon from Dy 3+ to Eu 3+ can be found in the Dy 3+ , Eu 3+ co-doped CLPO phosphors, and the color was tuned from red to blue upon 395 nm excitation with Eu 3+ concentration decreasing. The energy transfer characteristic was evidenced by the excitation spectra, emission spectrum and decay time of the synthesized phosphors, and the mechanism of energy transfer from Dy 3+ to Eu 3+ was evaluated as a dipole–quadrupole interaction. In addition, temperature-dependent spectra were performed and the activation energy was further evaluated about 0.1902 eV. The results indicate the potential application of CLPO:Dy 3+ ,Eu 3+ phosphors in white LEDs.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-020-03563-w