Dualistic temperature sensing in Er3+/Yb3+doped CaMoO4upconversion phosphor.
Temperature sensing performance of Er3+/Yb3+doped CaMoO4phosphor prepared via polyol method is reported herein. The X-ray diffraction, Fourier transform infrared spectroscopy and field emission scanning electron microscopy are done to confirm the phase, structure and purity of the synthesized phosphor. The infrared to green upconversion emission is investigated using 980nm diode laser excitation along with its dependence on input pump power and external temperature. The temperature dependent fluorescence intensity ratio of two upconversion emission bands assigned to2H11/2→4I15/2(530nm) and4S3/2→4I15/2(552nm) transitions has shown two distinct slopes in the studied temperature range - 300 to 760K and therefore, dual nature of temperature sensitivity is observed in this phosphor. This phenomenon in rare earth doped materials is either scarcely reported or overlooked. The material has shown higher sensitivity in the high temperature region (535K<T<760K) with a maximum of 7.21×10-3K-1at 535K. The results indicate potential of CaMoO4: Er3+/Yb3+phosphor in high temperature thermometry.
Optical Materials & Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India.
Shriya
S
Sinha
Optical Materials & Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India.
Manoj Kumar
MK
Mahata
Optical Materials & Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India. Electronic address: kumar.bhu@gmail.com.
Kaushal
K
Kumar
Optical Materials & Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India.
S P
SP
Tiwari
Optical Materials & Bio-imaging Research Laboratory, Department of Applied Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India.
V K
VK
Rai
Fluorescence intensity ratio (FIR); Polyol method; Temperature sensing; Upconversion