期刊
DYES AND PIGMENTS
卷 156, 期 -, 页码 8-16出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2018.03.053
关键词
Phosphors; Energy transfer; Warm white light; White LEDs; Dy3+ ions
资金
- National Natural Science Foundation of China [51502190]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
- Taiyuan University of Technology [Tyutrc201489a, 2014YQ009, 2015YQ006, 2016YQ03]
- State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2017-skllmd-01]
Dy3+ singly doped and Dy3+/Eu3+ co-doped Na3Sc2(PO4)(3) phosphors were synthesized by high temperature solid-state reaction and their photoluminescence properties were investigated. The prepared phosphors have a single phase trigonal structure of Na3Sc2(PO4)(3) and consist of micro-particles with an average particle size about 13.8 mu m. Among all the Na3Sc2(PO4)(3):xDy(3+) samples, 5 mol% of Dy3+ ions is found to be optimum concentration because it shows strongest emission intensity under 350 nm excitation. Under 350 nm excitation, the emission spectra of Na3Sc2(PO4)(3):0.05Dy(3+),yEu(3+) phosphors are composed of several bands associated with the transitions of both Dy3+ and Eu3+ ions from the F-4(9/2) and D-5(0) excited states, respectively. It is noticed that integrated emission intensities of Dy3+ ions were decreased with the increase of Eu3+ ion concentration due to energy transfer from Dy3+ to Eu3+ ions. The Dexter theory and Reisfield's approximation were employed to analyze the energy transfer mechanism and it is found that the dipole-dipole interaction is responsible for energy transfer from Dy3+ to Eu3+ ions. Among the Na3Sc2(PO4)(3):0.05Dy(3+),yEu(3+) phosphors, 5 mol% of Dy3+ and 20 mol% of Eu3+ are found to be optimum concentrations because it emits strong warm white light under 350 nm excitation. Further, the quantum efficiency, lifetime, energy transfer efficiency and correlated color temperature (CCT) values of the present phosphors were estimated and compared with the other reported phosphors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据