Novel Bi3+/Eu3+ co-doped oxyfluoride transparent KY3F10 glass ceramics with wide tunable emission and high optical temperature sensitivity

A series of novel oxyfluoride borosilicate glass ceramics (GCs) possessing KY3F10 crystalline phase co-doped fixed 0.3 mol% Bi3+ and various Eu3+ from 0 to 1.0 mol% were obtained from the system of SiO2-B2O3-K2O-YF3-KF-Bi2O3-Eu2O3 matrix glass. The emission of the GCs was effectively impacted by both the excitation wavelength and Eu3+ concentration. A tunable luminescence from blue to pink can be adjusted by change of Eu3+ concentration from 0 to 1 mol% under excitation of 280 nm for 0.3 mol% Bi3+ /y mol% Eu3+ co-doped GCs, while from orange to pink by change of excitation wavelength from 260 to 300 nm for 0.3 mol% Bi3+/1 mol% Eu3+ co-doped GCs. The energy transfer (ET) process from Bi3+ to Eu3+ and the emissions of both Bi3+ and Eu3+ are mainly response for the tunable emission of the GCs. Referring to the fluorescence relative intensity ratio (FIR) between 412 nm (Bi3+ : S-1(0) -> P-3(1)) and 615 nm (Eu-3(+):D-5(0)-> F-7(2)) determining from temperature-dependent spectra in a wide temperature range of 298-548 K, two crucial parameters of absolute sensitivity (Sa) and relative sensitivity (Sr) of the sample are estimated up to 1.82 % K-1 at 548 K and 3.84 % K-1 at 298 K, respectively. Such high optical temperature sensitivity, widely strong tunable emission and the excellent chemical physical properties endow the GCs a potential candidate for non-contact optical thermometry and multi-color display.

Automated summary

A series of novel oxyfluoride borosilicate glass ceramics with fixed 0.3 mol% Bi3+ and varying Eu3+ concentrations from 0 to 1.0 mol% show tunable luminescence from blue to pink or orange to pink, depending on excitation wavelength and Eu3+ concentration. The energy transfer process from Bi3+ to Eu3+ and the emissions from both ions play a key role in the tunable emission of the glass ceramics.