Bin Duan,Changchun Ding,Mengjia Zhang,Yuxiang Wu,Yongqiang Li,Wei Jin,Fengyi Wang,Junshan Hu
Exploring novel oxysalt compounds remains significant due to their affordability and versatile applications, such as serving as laser crystals, piezoelectric crystals, frequency-doubling crystals, and luminescent materials. Specifically, this study introduces a new near-single green upconversion luminescent Ca 9 (VO 4 ) 7 : Yb 3+ /Er 3+ material, synthesized through high-temperature solid-phase methods. When subjected to 980 nm near-infrared laser irradiation, the Ca 9 (VO 4 ) 7 : 0.3 Yb 3+ , 0.02 Er 3+ phosphor demonstrates robust green luminescence at 531 nm ( 2 H 11/2 → 4 I 15/2 ) and 558 nm ( 4 S 3/2 → 4 I 15/2 ), accompanied by faint red luminescence at 665 nm ( 4 F 9/2 → 4 I 15/2 ). The optimal doping concentrations for Yb 3+ and Er 3+ ions, yielding the highest upconversion luminescence intensity, are determined to be 0.3 and 0.02, respectively. The investigation elucidates the upconversion luminescence mechanism through the downward shift spectrum in photoluminescence and the pumping power dependence of upconversion green-red luminescence. The primary excitation pathway identified for the upconversion process in Ca 9 Y(VO 4 ) 7 : 0.3 Yb 3+ , 0.02 Er 3+ involves Yb 3+ ( 2 F 5/2 ) + Er 3+ ( 4 I 11/2 ) → Yb 3+ ( 2 F 7/2 ) + Er 3+ ( 4 F 7/2 ). This research contributes to the exploration of new materials, injecting vitality into modern industries and production processes.
Bin Duan,Changchun Ding,Yuxiang Wu,Yongqiang Li,Wei Jin,Fengyi Wang,Junshan Hu
The present work investigates the near-single green emission properties of Ba 2+ doped Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ upconversion luminescence. The Ba 2+ doped Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ phosphors were successfully synthesized via the high-temperature solid-phase method. XRD pattern analysis showed that Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ was a single phase, and Ba 2+ doping did not induce heterophase phase. Under 980 nm near-infrared laser irradiation, Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ phosphors emit strong green luminescence (530 nm, 2 H 11/2 → 4 I 15/2 , 557 nm, 4 S 3/2 → 4 I 15/2 ) and weak red luminescence (664 nm, 4 F 9/2 → 4 I 15/2 ). The upconversion green-red luminescence integral intensity ratio of Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ phosphor is 32.1. This enhancement can be attributed to the presence of defect bands that facilitate excitation photon absorption and efficient energy transfer from abundant electrons into Yb 3+ ( 2 F 5/2 ) and Er 3+ ( 4 I 11/2 ) ions. More importantly, the maximum S A and S R of Ca 9 Y(VO 4 ) 7 : Yb 3+ /Er 3+ /Ba 2+ phosphor as a temperature sensor are 1.44 % K −1 (at 548 K) and 1.28 % K −1 (at 298 K), respectively.
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