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Mid-IR spectroscopy of Er ³⁺ doped low-phonon CsCdCl ₃ and CsPbCl ₃ crystals

https://doi.org/10.1364/JOSAB.470152

Brown, Ei_Ei; Fleischman, Zackery_D; McKay, Jason; Hommerich, Uwe; Kabir, Al_Amin; Riggins, Jazmine; Trivedi, Sudhir; Dubinskii, Mark (September 2022, Journal of the Optical Society of America B)

The mid-IR spectroscopic properties of

{E r}^{3 +}

doped low-phonon

{C s C d C l}_{3}

and

{C s P b C l}_{3}

crystals grown by the Bridgman technique have been investigated. Using optical excitations at

\sim<#comment/> 800 n m

and

\sim<#comment/> 660 n m

, both crystals exhibited IR emissions at

\sim<#comment/> 1.55

\sim<#comment/> 2.75

\sim<#comment/> 3.5

, and

\sim<#comment/> 4.5 µ<#comment/> m

at room temperature. The mid-IR emission at 4.5 µm, originating from the

^{4} I_{9 / 2} \to<#comment/>^{4} I_{11 / 2}

transition, showed a long emission lifetime of

\sim<#comment/> 11.6 m s

for

{E r}^{3 +}

doped

{C s C d C l}_{3}

, whereas

{E r}^{3 +}

doped

{C s P b C l}_{3}

exhibited a shorter lifetime of

\sim<#comment/> 1.8 m s

. The measured emission lifetimes of the

^{4} I_{9 / 2}

state were nearly independent of the temperature, indicating a negligibly small nonradiative decay rate through multiphonon relaxation, as predicted by the energy-gap law for low-maximum-phonon energy hosts. The room temperature stimulated emission cross sections for the

^{4} I_{9 / 2} \to<#comment/>^{4} I_{11 / 2}

transition in

{E r}^{3 +}

doped

{C s C d C l}_{3}

and

{C s P b C l}_{3}

were determined to be

\sim<#comment/> 0.14 \times<#comment/> 10^{-<#comment/> 20} {c m}^{2}

and

\sim<#comment/> 0.41 \times<#comment/> 10^{-<#comment/> 20} {c m}^{2}

, respectively. The results of Judd–Ofelt analysis are presented and discussed.

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