Abstract
A series of phosphors Ca14Zn6Ga10O35:Mn4+, Ln3+ (Ln = Nd, Yb, Er) have been prepared by conventional high temperature solid-state reaction. Mn4+ single doped Ca14Zn6Ga10O35 shows deep red emitting, and it can obtain NIR emission when co-doped with Ln3+ in Ca14Zn6Ga10O35:Mn4+via an efficient energy transfer from Mn4+ to Ln3+. This process mainly is attributed to the dipole-dipole interaction mechanism. Visible-NIR to NIR down-shifting is realized via the energy transfer from Mn4+ to Ln3+ ions. Reversely, the green emission of Er3+ can be observed upon 980 nm light excitation, and the red emitting of Mn4+ appears in Mn4+ and Er3+ co-doped Ca14Zn6Ga10O35 phosphors through the up-converted energy transfer from Er3+ to Mn4+. Two-photon processes are required to populate the 2H11/2, 4S3/2 and 4F9/2 excited states of Er3+. The dual-mode luminescence mechanism, including energy transfer from Mn4+ to Ln3+ and up-conversion energy transfer from Er3+ to Mn4+, has been discussed in detail.
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