Regulation of Luminescence Intensity in Different Luminescent Centers by doping La3+ ions in Eu2+–activated phosphor–silicate apatite Sr3CeNa(PO4)2SiO4 phosphor

Countdown
0 days

Important Dates

Conference:

Apr. 22-24, 2019

Full Paper Due: Mar. 18, 2019

Abstract Due: Mar. 18, 2019

Audience Registration Due:
Apr. 22, 2019

Presentations of The Spring World Congress on Engineering and Technology (SCET 2017)

● Regulation of Luminescence Intensity in Different Luminescent Centers by doping La3+ ions in Eu2+–activated phosphor–silicate apatite Sr3CeNa(PO4)2SiO4 phosphor
Author(s)
Yue Guo
Affiliation(s)
Department of Physics, Pukyong National University, Busan 48513, South Korea
KEYWORDS
Luminescence Intensity, Luminescent Centers, La3+ ions, Eu2+–activated phosphor–silicate apatite Sr3CeNa(PO4)2SiO4 phosphor
ABSTRACT
In the exploration of w-LEDs, it is noteworthy that multi-sites emissions of phosphors as one of the most potential phosphors have provided a great contribution on the development of LEDs. Multi-sites emission can provide different colors of light, improve luminous efficiency, save raw materials and improve material utilization. However, not all of the multi-sites emissions are beneficial to practical applications. In some cases, we need to make appropriate regulations of luminescence intensity in different luminescent centers to achieve the desired purpose.We have synthesized and investigated the effect of La3+ ions in novel phosphor–silicate apatite Sr2.99CeNa(PO4)2SiO4: 0.01Eu2+ (abbreviated as SCNPS: xEu2+) phosphors, showing the regulation of luminescence intensity in different luminescent centers. The band gap E_g of pure SCNPS is estimated to be about 5.47 eV. The Eu2+–activated SCNPS phosphors show a strong absorption band ranging from 230 to 400 nm, suggesting that these solid solutions can be properly excited by a UV/near–UV used phosphor–converted LED chip. The crystal structure and luminescent spectra were used to prove the existence of two luminescence centers of Eu2+ ions in SCNPS host. The orderly changes of Eu2+ emission intensities over two kinds of Sr sites suggested that the La3+ ions incorporation in SCNPS: 0.01Eu2+ can affect the performance and characteristics of Eu2+ ions. Furthermore, our work also encourages research on the luminous effect of site occupancy and the local environment of luminescence centers.