Organic mediated synthesis of highly luminescent Li + ion compensated Gd 2 O 3 :Eu 3+ nanophosphors and their Judd–Ofelt analysis

• Published in: RSC advances Vol. 6; no. 71; pp. 67295 - 67307
• Main Authors: Kumar, R. G. Abhilash, Hata, Satoshi, Ikeda, Ken-ichi, Gopchandran, K. G.
• Format: Journal Article
• Language: English
• Published: 2016
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/C5RA26095G

Highly luminescent red emitting Gd 2 O 3 :Eu 3+ , Li + nanophosphor has been synthesized by the solvothermal combustion of the metal–citrate complex in diethylene glycol medium. The morphology and luminescence properties of these nanophosphors are found to be highly sensitive to the extent of lithium ion compensation. It is found that lithium ions promote grain growth and alter the morphology of the Gd 2 O 3 :Eu 3+ nanophosphor from nearly spherical to cobblestone like. A significant enhancement in intensity of luminescence and quantum efficiency is observed in lithium compensated nanophosphors. The highest emission intensity is observed for the Gd 1.75 Eu 0.1 Li 0.15 O 3 nanophosphor, about 1.83 times that of Gd 1.9 Eu 0.1 O 3 and is attributed to the enhanced intra 4f–4f emission transitions arising from the modifications of the crystal field and distortion of the local symmetry around the europium ions. The luminescence decay profiles are found to be single exponential in nature and the lifetime measured was 1.36 ms for the Gd 1.75 Eu 0.1 Li 0.15 O 3 nanophosphor. The chromaticity coordinates of these nanophosphors indicated high colour purity. Judd–Ofelt intensity parameters indicated that lithium compensation increases the polarization of the local environment and an increase of covalency and asymmetry around the europium ions.