Journal
OPTICAL MATERIALS
Volume 114, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2021.110981
Keywords
Self-reduction; Chemical co-precipitation method; Charge compensation; Thermal stability; Lifetime
Categories
Funding
- Fundamental Research Funds for Central Universities
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By doping Na+ and K+ ions into BaSiO3:Eu phosphor, as well as using self-compensated Ba0.88SiO3:0.08Eu samples, the emission intensity of Eu3+ ions was enhanced and emission purity was improved. Additionally, co-doping of Na+ ions improved temperature stability and lifetime compared to Ba0.92SiO3:0.08Eu phosphor.
To investigate the effect and mechanism of different charge compensation on the luminescent property of Eudoped BaSiO3, Ba0.92SiO3:0.08Eu, Ba0.88SiO3:0.08Eu and Ba0.84SiO3:0.08Eu, 0.08R+ (R = Na, K) phosphors were synthesized via co-precipitation method and the precursors were calcined in air. The crystal structure of the phosphors was analyzed by X-ray diffraction (XRD) and photoluminescence property was assessed by a spectrophotometer. Different charge compensation methods were carried out for BaSiO3:Eu phosphor, including doping Na+ ions and K+ ions, and Ba0.88SiO3:0.08Eu phosphors were used as self-compensated samples. The photoluminescence (PL) spectra of samples excited at 345 nm revealed that Eu2+ ions hardly existed in BaSiO3 host co-doped with K+ ions, indicating that the self-reduction of Eu3+ ions was restrained. Besides, the charge compensation method enhanced the emission intensity of Eu3+ ions both under 394 nm and 250 nm excitation, as well as the purity of the red-emitting phosphor. It was found that Ba0.84SiO3:0.08Eu,0.08Na+ showed better temperature stability and a longer lifetime than the Ba0.92SiO3:0.08Eu phosphor, suggesting that co-doping of Na+ ions was beneficial to this phosphor.
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