Khan, Atif F. and Yadav, Ravishanker and Mukhopadhya, P. K. and Singh, Sukhvir and Dwivedi, Charu and Dutta, Viresh and Chawla, Santa (2011) Core-shell nanophosphor with enhanced NIR-visible upconversion as spectrum modifier for enhancement of solar cell efficiency. Journal of Nanoparticle Research, 13 (12). pp. 6837-6846.
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A distinct enhancement of upconversion luminescence from core to core/shell (C/S) structure under low flux near infrared (NIR) excitation at 976 nm has been achieved in lanthanide (Er 3+ , Yb 3+ )-doped NaYF 4 core with undoped NaYF 4 shell nanoparticles (NP). A green chemistry approach has been taken to synthesize monodisperse monophasic C/S NP with the core (~20 nm) and shell (~5 nm) crystallizing into cubic phase. Hydrophobic C/S NP have been further made hydrophilic by coating a transparent SHMP layer without affecting luminescence. C/S (NaYF 4 : Er, Yb/NaYF 4 ) NP integrated dye-sensitized solar cell indicated 11.9% enhancement in overall conversion efficiency under AM 1.5 conditions, due to NIR–visible spectrum modification by fluorescent NPs. The results indicate great potential of such upconverting C/S nanophosphor in solar cell applications.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||05 Jan 2012 09:29|
|Last Modified:||05 Jan 2012 09:42|
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