We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Luminescence properties of Ca and Si co-doped strontium molybdate red phosphors for white LEDs.
- Authors
Wu, Dong-ni; Gong, Xin-yong; Cui, Rui-rui; Deng, Chao-yong
- Abstract
SrCaMoO:Eu (0.15 ≤ x ≤ 0.45) and SrCa(MoSi)O:Eu (0 ≤ y ≤ 0.08) red phosphors materials for white LEDs were synthesized by the high temperature solid state reaction. The properties were characterized by means of X-ray diffraction (XRD) and photoluminescence spectra. The XRD pattern shows that the SrCaMoO:Eu and SrCa(MoSi)O:Eu phosphors sintered at 800 °C for 5 h are SrMoO phase. And the samples are crystallized well with the scheelite structure. The luminescent properties of SrCa(MoSi)O:Eu with various concentration of Ca and Si were investigated in detail. The results indicate that SrCaMoO:Eu and SrCa(MoSi)O:Eu phosphors can be excited by 394 and 464 nm lights and their light emitting properties were improved by co-doping Si and Ca ions. The emission spectra exhibit the most intense emission at 611 and 615 nm, and the latter is corresponding to the D → F transition of the Eu. Compared with SrCaMoO:Eu, the emission intensity of SrCa(MoSi)O:Eu is increased obviously. It is found that appropriate Ca and Si concentration can enhance the luminescent intensity and improve crystallization, and the highest emission intensity on the 615 nm is exhibited when x = 0.25 and y = 0.05. Moreover, the CIE chromaticity ( x, y) of SrCa(MoSi)O:Eu excited by 394 nm light are analyzed. When the doping x of Ca is 0.02 and y of Si is 0.05, phosphors of the samples turn from pink to red. These results present that the SrCa(MoSi)O:Eu is an efficient red emitting phosphor for white LED applications.
- Subjects
SILICON; CALCIUM; LUMINESCENCE; LIGHT emitting diodes; X-ray diffraction; PHOTOLUMINESCENCE
- Publication
Journal of Materials Science: Materials in Electronics, 2016, Vol 27, Issue 9, p9661
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-016-5026-z