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The excitation and decay mechanisms of the Yb 3+ 4f-4f intra-shell emission in InP and InAsP (4% and 7% of As) are analysed. Exciton binding by Yb ion is discussed. The photoluminescence transient measurements indicate that the Yb PL emission is deactivated at increased temperature by energy back-transfer to band states of InP and InAsP.
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