Structural and optical properties of thermal decomposition assisted Gd2O3:Ho(3+)/Yb(3+) upconversion phosphor annealed at different temperatures.
The infrared to visible upconversion fluorescent nanoparticles of Ho(3+)/Yb(3+) codoped Gd2O3 phosphor is synthesized via thermal decomposition route. The as-synthesized sample was annealed at 800, 1000 and 1200°C for 3h and then structural and optical properties were studied. The Rietveld refinement of X-ray diffraction (XRD) data was analyzed to probe the effect of Ho(3+)/Yb(3+) dopant on the structural parameters of Gd2O3 host. The upconversion emission spectra of as-synthesized and annealed samples are compared using 980nm diode laser excitation and five emission bands noticed at 490, 539, 550, 667 and 757nm corresponding to the (5)F3→(5)I8, (5)F4→(5)I8, (5)S2→(5)I8,(5)F5→(5)I8 and (5)I4→(5)I8 manifolds, respectively. The local temperature induced by laser light is also calculated. The fluorescence intensity ratio (FIR) of two thermally coupled transitions (5)F4→(5)I8 and (5)S2→(5)I8 is plotted against the sample temperature and sensor sensitivity of sample is calculated.
Optical Materials and Bioimaging Research Laboratory, Department of Applied Physics, Indian School of Mines, Dhanbad 826004, Jharkhand, India.
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Kumar
Optical Materials and Bioimaging Research Laboratory, Department of Applied Physics, Indian School of Mines, Dhanbad 826004, Jharkhand, India.
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Tiwari
Optical Materials and Bioimaging Research Laboratory, Department of Applied Physics, Indian School of Mines, Dhanbad 826004, Jharkhand, India. Electronic address: kumar.bhu@gmail.com.
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Kumar
Laser and Spectroscopy Laboratory, Department of Applied Physics, Indian School of Mines, Dhanbad 826004, Jharkhand, India.
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Rai
Local temperature; Temperature sensing; Thermal decomposition method; Upconversion emission