Structure, optical characteristics and temperature sensing performance studies of Cs3YF6: Er3+, Yb3+ up-conversion material with cryolite structure

Cryolite has been considered as an appropriate host for up-conversion materials due to its low phonon energy, wide light transmission range, easy to form waveguide and stable structure. In this paper, a series of up-conversion materials Cs 3 YF 6 : Er 3+ , Yb 3+ with cryolite structure were prepared by high-temperature solid-phase method. The structure, morphology, element composition and up-conversion luminescence properties of as-prepared samples were characterized. In addition, the number of photons absorbed during the up-conversion process and the possible up-conversion luminescence mechanism are analyzed in detail. Under the excitation of 980 ​nm, the Cs 3 YF 6 : Er 3+ , Yb 3+ sample emits strong green light visible to the naked eye. Simultaneously, the maximum absolute sensitivity (S a ) and relative sensitivity (S r ) were calculated. All the results indicated that Cs 3 YF 6 : Er 3+ , Yb 3+ has potential applications in the fields of green light display and temperature sensing.