Journal
DALTON TRANSACTIONS
Volume 48, Issue 29, Pages 10824-10833Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9dt01917k
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Funding
- National Natural Science Foundation of China [11674044, 11604037, 11704054]
- Chongqing Research Program of Basic Research and Frontier Technology [CSTC2016JCYJA0113, CSTC2016JCYJA0207, CSTC2017jcyjAX0046]
- Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJQN201800619, KJ1600406, KJZD-K201800602]
- Wenfeng High-end Talents Project of Chongqing University of Posts and Telecommunications [W2017-06, W2016-30]
- Scientific Research Foundation For Doctor of Chongqing University of Posts and Telecommunications [A2008-59]
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Rare earth-doped Ba3La(VO4)(3) phosphors with tunable emitting colors were firstly explored and their photoluminescence properties were systematically investigated. The experimental results show that the Ba3La(VO4)(3) phosphors exhibit high-brightness self-activated emission and enable us to sensitize the luminescence of rare earth activators. Under near-ultraviolet (UV) excitation, both the broadband emission from VO43- groups and the sharp peak emissions from Eu3+ ions are observed in Ba3La(VO4)(3):Eu3+ phosphors. Modulation of the emitting color from green to red can be realized by adjusting the Eu3+ doping concentration, which is assigned to an efficient energy transfer from VO43- to Eu3+ ions. Notably, the optical thermometry of Ba3La(VO4)(3):Eu3+ was characterized based on the fluorescence intensity ratio of VO43- and Eu3+ emissions in the 298-573 K range, with the maximum absolute and relative sensitivities of 0.0515 K-1 and 1.77% K-1 at 298 K. In addition, similar phenomena were observed in Sm3+ and Dy3+-doped Ba3La(VO4)(3) phosphors. These results verify a feasible strategy for varying the emission color and realizing optical thermometry in the single-component phosphors by adjusting the energy transfer between the host and the activator. It provides new possibilities for the design of multifunctional materials for white light-emitting diodes and non-contact thermometry.
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