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

Abstract 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 3P1 → 1S0 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 Bi3+ and Eu3+) intensity ratio and thermal stability. The maximum relative sensitivity Sr 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.