Broadband-excited and green-red tunable emission in Eu2+-sensitized Ca8MnTb(PO4)7 phosphors induced by structural-confined cascade energy transfer

Jiaqi Fan; Weiying Zhou; Zhan-chao Wu; Ye Yang; Peichan Chen; Qi Pang; Liya Zhou; Chunyan Zhou; Fuwang Mo; Xinguo Zhang

doi:10.1039/D2DT04107C

Broadband-excited and green-red tunable emission in Eu²⁺-sensitized Ca₈MnTb(PO₄)₇ phosphors induced by structural-confined cascade energy transfer

Jiaqi Fan,†^a Weiying Zhou,†^a Zhan-chao Wu,

^b Ye Yang,^c Peichan Chen,^c Qi Pang,^c Liya Zhou,

^c Chunyan Zhou,^d Fuwang Mo^e and Xinguo Zhang

*^a

Author affiliations

* Corresponding authors

^a NMPA Key Laboratory for Research and Evaluation of Drug Metabolism, Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China
E-mail: mpcc1@qq.com

^b Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Science, Ministry of Education, Key Laboratory of Biochemical Analysis, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong Province, China

^c School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

^d College of Pharmaceutical Science, Guangxi Medical University, Nanning, China

^e Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization, College of Materials and Chemical Engineering, Hezhou University, Hezhou 542899, China

Abstract

Novel green-red color-tunable Ca₈(Mg,Mn)Tb(PO₄)₇:Eu²⁺ phosphors have been synthesized via the traditional solid-state method. Since Tb³⁺/Mn²⁺ ions are the parent ions in the lattice, the structural confinement occurs when the sensitizer Eu²⁺ is introduced into the Ca₈(Mg,Mn)Tb(PO₄)₇:Eu²⁺ structure. The distance from Eu²⁺ to Tb³⁺/Mn²⁺ is confined in the 5 Å range, which induces a highly efficient energy transfer process. At Eu²⁺ 350 nm excitation, Ca₈MgTb(PO₄)₇:Eu²⁺ shows dominant Tb³⁺ green emission with almost-vanished Eu²⁺ emission. Red emission is clearly observed as Mn²⁺ ions doping into Ca₈MgTb(PO₄)₇:Eu²⁺, and color-tuning from green to red is realized by varying the Mn²⁺ contents. Eu²⁺–Tb³⁺–Mn²⁺ cascade energy transfer process is in effect due to short Eu²⁺–Tb³⁺/Mn²⁺ and Tb³⁺–Mn²⁺ distances, which is verified by PL and decay variations. Meanwhile, the Ca₈(Mg,Mn)Tb(PO₄)₇:Eu²⁺ phosphor indicates good thermal stability and maintained the 45% emission level at 150 °C, which demonstrates their potential applications in white light LEDs.

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Broadband-excited and green-red tunable emission in Eu²⁺-sensitized Ca₈MnTb(PO₄)₇ phosphors induced by structural-confined cascade energy transfer

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Broadband-excited and green-red tunable emission in Eu²⁺-sensitized Ca₈MnTb(PO₄)₇ phosphors induced by structural-confined cascade energy transfer

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