Recent progress of effect of crystal structure on luminescence properties of Ce3+-Eu2+Co-doped phosphors

Abstract

Currently, the mechanism of Ce3+-Eu2+ET is frequently used to obtain color adjustable or white phosphors. Correspondingly, the ET efficiency from Ce3+to Eu2+becomes an important indication of the luminescent properties of phosphors. However, the ET efficiency calculated using the formula does not always match the emission spectra; the transmission efficiency of Ce3+is high, but the emission efficiency of Eu2+is low, depending on our investigation results. In addition to this problem, here we mainly review, on the basis of substantial examples, how to boost the actual ET efficiency of Ce3+-to-Eu2+and thus to improve the luminescent properties of phosphors through the rational design of layered crystal structure and the way of selective occupation of activator ions. Moreover, the possible physical mechanisms are proposed.