Journal
OPTICAL MATERIALS
Volume 98, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2019.109403
Keywords
Crystal structure; Luminescence; Absorption property; Band gap
Categories
Funding
- National Natural Science Foundation of China [51772330, 51472273]
- National Key Research and Development Plan [2016YFB0701301]
- BSRF (Beijing Synchrotron Radiation Facilities)
- Hunan Provincial Science and Technology Department [2014FJ4099]
- outstanding graduate project of Advanced Non-ferrous Metal Structural Materials and Manufacturing Collaborative Innovation Center [510070027]
- Project of Innovation-driven Plan in Central South University [2015CX004]
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A series of novel Dy3+/Eu3+/Sm3+-activated InNbTiO6 phosphors have been prepared by conventional solid state reaction method. Based on the structure refinement, RE3+ ions are preferred to occupy the site of In3+ (2e) in the wolframite-type host lattice. According to their UV-visible diffusion reflectance spectra, the band gap and absorption property of un-doped InNbTiO6 sample can be tuned by the dopants. Under UV-visible light excitation, Dy3+/Eu3+/Sm3+ activators in this matrix mainly show emission lines originating from their characteristic f -> f transitions. The optimal excitation and emission wavelength are 385 nm and 581 nm for Dy3+, 394 nm and 616 nm for Eu3+, 406 nm and 615 nm for Sm3+. Concentration quenching occurs at 0.06 for Dy3+, 0.06 for Eu3+, and 0.04 for Sm3+, ascribed to resonant q-q, q-q, and d-q interactions, respectively. The luminescence lifetimes are determined to be 0.13, 0.50, and 0.50 ms for InNbTiO6:0.06Dy(3+), InNbTiO6:0.06Eu(3+), and InNbTiO6:0.04Sm(3+), respectively. The Dy3+, Eu3+, and Sm3+ doped phosphors exhibited yellowish-white, red, and orange-red luminescence, respectively. The quantum yields and thermal stability of representative phosphors have been investigated. Present work shows that these new phosphors are promising for application in UVLED solid-state lighting devices.
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