Infrared emission spectroscopy and upconversion of ZnO-Li 2 O-Na 2 O-P 2 O 5 glasses doped with Nd 3+ ions
- Citation data:
Journal of Non-Crystalline Solids, ISSN: 0022-3093, Vol: 457, Page: 157-163
- Publication Year:
- Materials Science; Physics and Astronomy
Glasses with composition 20ZnO-10Li 2 O-10Na 2 O-(60-x)P 2 O 5 -xNd 2 O 3 containing Nd 3+ ions were analyzed using density calculations and optical absorption spectroscopy together with excitation and emission luminescence measurements. The Judd-Ofelt intensity parameters (Ω 2, Ω 4, Ω 6 ) were calculated and their variation correlated with the physical properties. Infrared emission spectra were recorded at an excitation wavelength of 581 nm. The emission spectra showed emissions at 872 nm, 1053 nm and 1325 nm which corresponded to the 4 F 3/2 → 4 I 9/2, 4 F 3/2 → 4 I 11/2 and 4 F 3/2 → 4 I 13/2 transitions. A decrease in the emission intensity occurred beyond 1.5 mol% Nd 2 O 3 doping which was explained on the basis of concentration quenching of the ions. The infrared to visible upconversion process was also investigated for the prepared glasses. Three main emission bands at 530 nm, 590 nm and 687 nm were observed for excitation at 870 nm. These emission bands originated form the 4 G 7/2 level. Excited state absorption and energy transfer upconversion mechanisms which may be responsible for the upconversion were also discussed in the present work.