Conversion of broadband UV-visible light to near infrared emission by Ca14Zn6Al10O35: Mn4+, Nd3+/Yb3+

摘要

Efficient Ca14Zn6Al10O35: Mn4+, Nd3+/Yb3+ spectral conversion materials have been prepared by a sol-gel method. The Ca14Zn6Al10O35: Mn4+, Nd3+/Yb3+ materials can efficiently shift the short-wavelength sunlight in 250-550 nm spectral regions into near infrared emission which matches the higher sensitivity region of Si-based solar cells. The maximal energy transfer efficiency is 76.0% and 80.4% in Mn4+, Nd3+ and Mn4+, Yb3+ co-doped samples when excited at 460 nm, respectively. A dipole-dipole interaction is responsible for the energy transfer sensitization processes from Mn4+ to Nd3+/Yb3+ ions, which has been confirmed by Dexter's theory and the Yokota-Tanimoto model.