Optical thermometry based fluorescence intensity ratio in Y2Mg2Al2Si2O12:Bi3+,Eu3+ phosphors

An array of Y2Mg2Al2Si2O12:Bi3+,Eu3+ phosphors were successfully manufactured. The crystal phase, microscopic image and optical properties were systematically surveyed with X-ray diffraction patterns, scanning electron microscopy and fluorescence spectra, respectively. Under 282 nm excitation, for Y2Mg2Al2Si2O12:Bi3+ phosphors, a broadband emission center located at 319 nm was observed, which is derived from the P-3(1) -> S-1(0) transition. For Bi3+/Eu3+ co-doped samples, besides the 319 nm emission of Bi3+, a range of characteristic sharp lines of Eu3+ were observed. Meanwhile, the maximum efficiency of energy transfer (Bi3+ -> Eu3+) can arrive to 89.5%. According to the emission spectra at different temperature, the samples present an excellent temperature sensing property based on fluorescence (from Bi(3+ )and Eu3+) intensity ratio and thermal stability. The maximum relative sensitivity S-r reaches to 0.544 %K-1 at 573 K. The emission intensity at 483 K maintains 95.5% of that at 303 K. All above meaningful results indicate that the samples may have certain application value in the field of temperature measurement. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

An array of Y2Mg2Al2Si2O12:Bi3+,Eu3+ phosphors with high energy transfer efficiency and excellent temperature sensing properties were successfully synthesized in this study. These samples may have important application value in the field of temperature measurement.