Novel phosphor GdY2SbO7 co-dope with Eu3+ and Bi3+ for optical thermometer

A series of GdY 2 SbO 7 :Bi 3+ , Eu 3+ phosphors were prepared using the conventional solid-state reaction. In this study, the photoluminescence properties and temperature sensitivity of the samples were investigated. When Bi 3+ and Eu 3+ were codoped into GdY 2 SbO 7 , the intensity of Bi 3+ decreased with increasing Eu 3+ concentration, indicating a potential energy transfer from Bi 3+ to Eu 3+ . To examine the temperature sensitivity of the sample, its emission spectrum was investigated in the range of 300–500 K. Based on different temperature dependences of Bi 3+ and Eu 3+ , the relative sensitivity ( S r ) and absolute sensitivity ( S a ) of the samples were calculated using the fluorescence intensity ratio (FIR) and thermochromic methods. In FIR modes, S r based on I Eu 3+ /I Bi 3+ reached 1.26 % K −1  at 500 K, while S r on double excitation method reached 1.36 % K −1  at 340 K. In addition, according to the thermochromic properties of GdY 2 SbO 7 :Bi 3+ , Eu 3+ phosphor, the temperature-sensing ability of the sample was investigated, and S r reached a maximum value of 0.5996 % K −1  at 300 K.