Upendra Kumar, K.
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Spectroscopy and radiation trapping of Yb3+ ions in lead ph..:

Venkata Krishnaiah, K. ; Rajeswari, R. ; Upendra Kumar, K....
Journal of Quantitative Spectroscopy and Radiative Transfer.  140 (2014)  - p. 37-47 , 2014
 
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5

Dy3+-doped zinc fluorophosphate glasses for white luminesce..:

Vijaya, N. ; Upendra Kumar, K. ; Jayasankar, C.K.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy.  113 (2013)  - p. 145-153 , 2013
 
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Photoluminescence from the 5D4 level of Tb3+ ions in K–Ba–A..:

Jayasankar, C.K. ; Upendra Kumar, K. ; Venkatramu, V....
Journal of Non-Crystalline Solids.  353 (2007)  18-21 - p. 1813-1817 , 2007
 
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14

Yb3+/Tm3+ co-doped NaNbO3 nanocrystals as three-photon-exci..:

Pereira, A.F. ; Kumar, K. Upendra ; Silva, W.F....
Sensors and Actuators B: Chemical.  213 (2015)  - p. 65-71 , 2015
 
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