Energy transfer and highly thermal stability in single-phase SrY2O4:Bi3+,Sm3+ phosphors for UV-LEDs
| Autor: | Xiangling Tian, Rongfei Wei, Fangfang Hu, Lupeng Yang, Xing Zhang, Xiusha Peng, Hai Guo |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Biophysics Analytical chemistry Phosphor 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics medicine.disease_cause 01 natural sciences Biochemistry Thermoluminescence Atomic and Molecular Physics and Optics 0104 chemical sciences law.invention law Excited state medicine Thermal stability Chromaticity 0210 nano-technology Luminescence Ultraviolet Light-emitting diode |
| Zdroj: | Journal of Luminescence. 228:117606 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2020.117606 |
| Popis: | Thermal quenching is one of the most key challenges of ultraviolet converted white light-emitting diodes (UV converted WLEDs) when they operate at high driving current, in which the phosphors are subjected to the luminescence losses resulting from non-radiative transitions with augmenting temperature. Herein, novel single-phased Bi3+,Sm3+-doped SrY2O4 (SYO) phosphors with abnormal thermal quenching property were successfully prepared applying a high-temperature solid-state strategy. X-ray diffraction, luminescent behaviors, lifetimes and temperature-dependent emission properties were employed to study the obtained powder materials. Under UV light irradiation, tunable emission from blue to red based on the energy transfer (ET) from Bi3+ to Sm3+ via a dipole-dipole mechanism is realized. Significantly, the obtained phosphors do not display thermal quenching even up to 573 K (300 °C). And they exhibit tiny chromaticity shift even at high temperature, indicative of excellent color stability. These phenomena may be interpreted by the ET from defect levels to Bi3+ excited states, which was identified by thermoluminescence measurements. These results indicate potential applications of SYO:Bi3+,Sm3+ in UV converted WLEDs. |
| Databáze: | OpenAIRE |
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