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

• Published in: Applied physics. A, Materials science & processing Vol. 126; no. 5
• Main Authors: Niu, Jialiang, Ding, Heping, Zhou, Wei, Zhang, Ze, Bai, Dongsheng, Wang, Xinrui
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2020; Springer Nature B.V
• 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; Tunable color; Energy transfer; Phosphor; Thermal stability; Luminescence
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-020-03563-w

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.