White light emission from NaLa(PO3)4: Dy3+ single-phase phosphors for light-emitting diodes
| Autor: | Yongzheng Fang, Guoying Zhao, Fengxin Liu, Bobo Yang, Zhang Na, Liu Qihui |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Photoluminescence business.industry Process Chemistry and Technology Doping Analytical chemistry Phosphor Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Ion law Materials Chemistry Ceramics and Composites Optoelectronics Photoluminescence excitation Emission spectrum Chromaticity business Light-emitting diode |
| Zdroj: | Ceramics International. 41:1917-1920 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2014.09.078 |
| Popis: | White light emission phosphors NaLa(PO 3 ) 4 : Dy 3+ were synthesized by a solid-state method. XRD analysis confirmed that all the Dy 3+ doped phosphors are single phase. The photoluminescence excitation and emission spectra, concentration effect, decay property, and CIE coordinates were investigated. Strong excitation peaks of NaLa(PO 3 ) 4 : Dy 3+ were found around 350–400 nm, which matched well with those of the near-UV LED chips. Under 350 nm excitation the NaLa(PO 3 ) 4 : Dy 3+ exhibits intense white emission by combining the two emission peaks at 485 nm and 571 nm, attributed to the characteristic 4 F 9/2 – 6 H 15/2 and 4 F 9/2 – 6 H 13/2 transitions of Dy 3+ . The optimum doped concentration of Dy 3+ ions is around 6 mol% and the critical transfer distance of Dy 3+ is calculated as 15.4 A. In addition, the CIE chromaticity coordinates of NaLa(PO 3 ) 4 : Dy 3+ phosphors are (0.2923,0.3359). The results indicate that the NaLa(PO 3 ) 4 : Dy 3+ phosphors have great potential as a single-component white-light-emitting phosphor for UV-light-emitting diodes. |
| Databáze: | OpenAIRE |
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