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- Title
Abnormal Anti-Quenching and Controllable Multi-Transitions of Bi<sup>3+</sup> Luminescence by Temperature in a Yellow-Emitting LuVO<sub>4</sub>:Bi<sup>3+</sup> Phosphor for UV-Converted White LEDs.
- Authors
Kang, Fengwen; Peng, Mingying; Zhang, Qinyuan; Qiu, Jianrong
- Abstract
Phosphors with an efficient yellow-emitting color play a crucial role in phosphor-converted white LEDs (pc-WLEDs), but popular yellow phosphors such as YAG:Ce or Eu2+-doped (oxy)nitrides cannot smoothly meet this seemingly simple requirement due to their strong absorptions in the visible range. Herein, we report a novel yellow-emitting LuVO4:Bi3+ phosphor that can solve this shortcoming. The emission from LuVO4:Bi3+ shows a peak at 576 nm with a quantum efficiency (QE) of up to 68 %, good resistance to thermal quenching ( T50 %=573 K), and no severe thermal degradation after heating-cooling cycles upon UV excitation. The yellow emission, as verified by X-ray photoelectron spectra (XPS), originates from the (3P0,3P1)→1S0 transitions of Bi3+. Increasing the temperature from 10 to 300 K produces a temperature-dependent energy-transfer process between VO43− groups and Bi3+, and further heating of the samples to 573 K intensifies the emission. However, it subsequently weakens, accompanied by blueshifts of the emission peaks. This abnormal anti-thermal quenching can be ascribed to temperature-dependent energy transfer from VO43− groups to Bi3+, a population redistribution between the excited states of 3P0 and 3P1 upon thermal stimulation, and discharge of electrons trapped in defects with a trap depth of 359 K. Device fabrication with the as-prepared phosphor LuVO4:Bi3+ has proved that it can act as a good yellow phosphor for pc-WLEDs.
- Subjects
QUENCHING (Chemistry); LUMINESCENCE; PHOSPHORS; LIGHT emitting diodes; X-ray photoelectron spectroscopy; ENERGY transfer
- Publication
Chemistry - A European Journal, 2014, Vol 20, Issue 36, p11522
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201402081