Single-Phase White Light-Emitting Ca x Ba(9- x)Lu2Si6O24:Eu2+/Mn2+ Phosphors

Sayed Ali Khan; Hao Zhong; Weiwei Ji; Lu-Yuan Hao; Hamidreza Abadikhah; Xin Xu; Noor Zamin Khan; Simeon Agathopoulos

doi:10.1021/acsomega.7b00985

Single-Phase White Light-Emitting Ca _x Ba_{(9- x)}Lu₂Si₆O₂₄:Eu²⁺/Mn²⁺ Phosphors

ACS Omega. 2017 Sep 29;2(9):6270-6277. doi: 10.1021/acsomega.7b00985. eCollection 2017 Sep 30.

Authors

Sayed Ali Khan¹, Hao Zhong¹, Weiwei Ji¹, Lu-Yuan Hao¹, Hamidreza Abadikhah¹, Xin Xu¹, Noor Zamin Khan¹, Simeon Agathopoulos²

Affiliations

¹ Chinese Academy of Science, Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, and Key Laboratory of Quantum Information, School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
² Materials Science and Engineering Department, University of Ioannina, GR-451 10 Ioannina, Greece.

Abstract

Single-phase white light-emitting Ca _x Ba_(9-x)Lu₂Si₆O₂₄:Eu²⁺/Mn²⁺ codoped phosphors were successfully synthesized, and their photoluminescence properties were experimentally determined. The analysis of the experimental results suggests that the partial substitution of Ba²⁺ ions by smaller Ca²⁺ ions alters the distribution of the Eu²⁺ luminescence center among the three available Ba²⁺ sites in the host lattice, which enables the emission to be efficiently tuned from blue to blue-green-yellow region. The incorporation of Mn²⁺ ions resulted in a red light emission at around 618 nm, through energy transfer from Eu²⁺ to Mn²⁺ ions via dipole-dipole interactions. The incorporation of Ca²⁺ and Mn²⁺ ions also resulted in improved thermal stability. The results qualify the produced Ca _x Ba_(9-x)Lu₂Si₆O₂₄:Eu²⁺/Mn²⁺ composition as a potential ultraviolet-convertible white light-emitting phosphor.