Controlled surface distribution and luminescence of YVO4:Eu3+ nanophosphor layers

Khan, A. F.; Haranath, D.; Yadav, Ravishanker; Singh, Sukhvir; Chawla, S.; Dutta, V.
August 2008
Applied Physics Letters;8/18/2008, Vol. 93 Issue 7, p073103
Academic Journal
A method of dispersing YVO4:Eu quantum dots (QDs) as uniform two-dimensional (2D) layers with a high degree of homogeneity is presented. Annealing at 773 K resulted in coalescence of QDs to form nanoclusters with size of ∼25 nm with an improved photoluminescence and ∼80% transmittance at 800 nm. An efficient 5D0-7F2 transition and lifetimes of ∼1038 μs for the characteristic Eu3+ emission were observed. The absorption and emission peaks showed a slight blueshift, due to quantum-size effect, as compared to that for the bulk counterpart. Our method of 2D layer deposition is useful to enhance spectral response of the solar cells.


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