caa a22 4500 445368675 CHVBK 20180317142939.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s00340-011-4379-5 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4379-5 Preparation and characterization of upconversion luminescent Tm3+/Yb3+ co-doped Y2O3 nanophosphor [Elektronische Daten] [K. Mishra, N. Giri, S. Rai] Tm3+/Yb3+ co-doped Y2O3 nanophosphor has been synthesized by the solution combustion technique. Heat treatment of the phosphor materials at higher temperatures modifies the structural and optical properties. At low concentration of Yb3+, an intense upconversion emission is observed in blue region (478nm) on excitation with 976nm radiations. Emission has also been observed in the ultraviolet (UV) region viz. at 300nm. The intensity of blue emission initially increases with dopant concentration as well as with the annealing temperature. However, for higher concentrations of Yb3+ (10mol%), emission in the blue region is greatly suppressed and NIR emission at 813nm appears with a large intensity. Intensity ratio of NIR and blue emission (I NIR/I B) reaches 74, resulting in almost monochromatic light at 813nm. To check the suitability of blue emission for display devices, CIE color coordinates (x,y), color purity and the dominant wavelength (λ d) for the blue emission have been calculated and the resulting value is found to be close to the coordinates of available standard blue phosphors. Springer-Verlag, 2011 Mishra K. Laser and Spectroscopy Laboratory, Department of Physics, BHU, 221005, Varanasi, India aut Giri N. Laser and Spectroscopy Laboratory, Department of Physics, BHU, 221005, Varanasi, India aut Rai S. Laser and Spectroscopy Laboratory, Department of Physics, BHU, 221005, Varanasi, India aut Applied Physics B Springer-Verlag 103/4(2011-06-01), 863-875 0946-2171 103:4<863 2011 103 340 https://doi.org/10.1007/s00340-011-4379-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4379-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mishra K. Laser and Spectroscopy Laboratory, Department of Physics, BHU, 221005, Varanasi, India aut NATIONALLICENCE 700 1- Giri N. Laser and Spectroscopy Laboratory, Department of Physics, BHU, 221005, Varanasi, India aut NATIONALLICENCE 700 1- Rai S. Laser and Spectroscopy Laboratory, Department of Physics, BHU, 221005, Varanasi, India aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 103/4(2011-06-01), 863-875 0946-2171 103:4<863 2011 103 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer