Upconversion luminescence and temperature sensing properties of Yb(MoO):Ln (Ln = Ho, Tm, Er) phosphors based on energy transfer

Yb 2 (MoO 4 ) 3 :Ln 3+ (Ln = Ho, Tm, Er) phosphors were synthesized by a hydrothermal method with further calcination. The crystal structure and morphology of the samples were characterized by X-ray diffraction and scanning electron microscopy. The effects of rare earth ion interaction in the Yb 2 (...

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Veröffentlicht in:CrystEngComm 2023-10, Vol.25 (38), p.5452-546
Hauptverfasser: Du, Huimin, Liang, Yunhao, Liu, Xingzuo, Deng, Yue, Yang, Jie, Yang, Jun, Hu, Shanshan
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Zusammenfassung:Yb 2 (MoO 4 ) 3 :Ln 3+ (Ln = Ho, Tm, Er) phosphors were synthesized by a hydrothermal method with further calcination. The crystal structure and morphology of the samples were characterized by X-ray diffraction and scanning electron microscopy. The effects of rare earth ion interaction in the Yb 2 (MoO 4 ) 3 :Ln 3+ phosphors on the upconversion (UC) luminescence properties and energy transfer process at different doping concentrations were discussed. It is concluded that by doping Ho 3+ , Tm 3+ , and Er 3+ in the Yb 2 (MoO 4 ) 3 host, the phosphors emit orange-yellow, blue and green light, respectively, and the energy transfer from Yb 3+ → Ho 3+ /Er 3+ and Yb 3+ → Tm 3+ is a two and three photon process, respectively. Under the excitation of a 980 nm laser, by changing the Ho 3+ /Tm 3+ ratio in doped Yb 2 (MoO 4 ) 3 , we have realized the transition of phosphors from cold white light to warm white light. The temperature sensitivity of the 2 H 11/2 and 4 S 3/2 energy levels of Yb 2 (MoO 4 ) 3 :Er 3+ in the range of 323-573 K was studied by the FIR technology. The experimental results show that the maximum absolute sensitivity was 0.0081 K −1 at 573 K and the maximum relative sensitivity was 0.01 K −1 at 323 K. Compared with other materials, the Er 3+ doped Yb 2 (MoO 4 ) 3 phosphor is an excellent optical temperature sensing material. Yb 2 (MoO 4 ) 3 :Ln 3+ (Ln = Ho, Tm, Er) phosphors were synthesized by a hydrothermal method with further calcination.
ISSN:1466-8033
DOI:10.1039/d3ce00497j