Abstract

Transparent ceramics (TCs) represent a new family of functional hard materials. In this Letter, steady-state and time-resolved upconversion photoluminescence in ${{\rm Yb}^{3 +}} {\text -} {{\rm Er}^{3 +}}$ co-doped TC of yttrium aluminum garnet (TC-YAG) are reported for the first time, to the best of our knowledge. Under the excitation of near-infrared 940 nm laser at room temperature, the ${{\rm Yb}^{3 +}} {\text -} {{\rm Er}^{3 +}}$ co-doped TC-YAG emits intense multi-color luminescence consisting of cyan, green, and red groups of sharp lines. More excitingly, the green group of luminescence due to the transitions from $^4{{\rm S}_{3/2}}$ to $^4{{\rm I}_{15/2}}$ states of ${{\rm Er}^{3 +}}$ are the prominent components with the average lifetime of $\sim{0.3}\;{\rm ms}$. The internal quantum efficiency of the green luminescence is estimated to be 32.8%. A unique dual-resonance energy transfer from ${{\rm Yb}^{3 +}}$ to ${{\rm Er}^{3 +}}$ via the excited-state vibronic transitions is proposed as the principal mechanism of the strongest green luminescence of ${{\rm Er}^{3 +}}$ ions in TC-YAG.

© 2020 Optical Society of America

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