期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 6, 期 37, 页码 9990-9999出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc03334j
关键词
-
资金
- National Natural Science Foundation of China (NSFC) [51672265, 51672266, 21521092, 51750110511, 51672257, 51672259]
- Key Research Program of Frontier Sciences, CAS [YZDY-SSW-JSC018]
- National Basic Research Program of China [2014CB643803]
- Scientific and Technological Department of Jilin Province [20150520029JH, 20170414003GH]
- Jiangmen Innovative Research Team Program
- Major Program of Basic Research and Applied Research of Guangdong Province [2017KZDXM083]
Controllable luminescence tuning can modify and improve the luminescence performances of phosphor materials and thus promote their application in white light emitting diodes (W-LEDs). Usually, crystal field modulation by constructing solid solutions based on diverse composition substitutions and energy transfers are effective strategies for adjusting the luminescence properties of phosphors. Herein, we report a series of novel emission-tunable Ba3-xSrxSc4O9:yBi(3+), zEu(3+) (x = 0-3.0, y = 0-0.15, z = 0-0.30) solid solution phosphors synthesized via a high-temperature solid-state route. The XRD patterns and Rietveld refinements were utilized to confirm the phase purity and analyze the structural variation. Cation substitution-dependent color-tunable evolution as a function of Sr content in Bi3+-doped Ba3-xSrxSc4O9 was observed and investigated in detail. The regular emission red-shift located in the blue-green region with the increase of Sr content was attributed to the combined effect of the crystal field splitting. Due to the suitable optical band gap (5.50 eV), Bi3+ ions realized a highly efficient doping in the Sr3Sc4O9 matrix. The as-prepared Sr3Sc4O9:Bi3+ samples were efficiently excited by UV light, and the photoluminescence properties presented obvious preferential-occupation selected excitation phenomenon where the emission peaks had remarkable red-shifts along with increasing the excitation wavelength. In addition, luminescence tuning from green to orange was achieved by designing the energy transfer from Bi3+ to Eu3+ ions in the as-prepared Sr2.97-zSc4O9:0.03Bi(3+), zEu(3+) samples and the corresponding mechanism was proposed. Moreover, the thermal stabilities of the studied phosphors were revealed. According to the distortion calculation of the Ba/Sr crystallographic occupation, the thermal stability is related to the lattice rigidity, which would become much stronger with the reduction of distortion. These results illustrate that the as-prepared Ba3-xSrxSc4O9:Bi3+, Eu3+ phosphors can be potential candidates for color-tunable phosphors applied in UV-pumped W-LEDs.
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