Abstract
The present work deals with inorganic–organic hybrid nanostructures capable of producingintense visible emission via upconversion (UC), downconversion (DC), and energy transfer(ET) processes which show the potential of the material as a luminescent solar collector(LSC), particularly to improve the efficiency of silicon solar cells. To achieve this,Gd2O3:Yb3 + /Er3 + phosphor (averageparticle size ∼ 35 nm) and a Eu(DBM)3Phen organic complex have been synthesized separately and then the hybrid structure has been developedusing a simple mixing procedure. Intense UC emission (in the red, green, and blue regions) due toEr3 + is observed on near infrared (976 nm) excitation which shows colortunability with input pump power. In contrast, intense red emission ofEu3 + is observed on ultaviolet (UV) (355 nm) excitation. The feasibility of energy transfer fromEr3 + ionsto Eu3 + ions has also been noted. These excellent optical properties are retained even if theparticles of the hybrid nanostructure are dispersed in liquid medium, which also makes itsuitable for security ink purposes.
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