Photoluminescence of CsMI₃:Eu²⁺ (M = Mg, Ca, and Sr) – a spectroscopic probe on structural distortions

Abstract

The delicate dependence of the photoluminescence properties of Eu2+ on the structure of the perovskite-analogue iodides CsMI3 (M = Mg, Ca, Sr) is discussed.

Potential Substitutes for Replacement of Lead in Perovskite Solar Cells: A Review

“…The study of photoluminescence properties of Eu 2+ ‐doped CsMI 3 [M‐Mg, Ca, Sr] perovskite has revealed that the Eu 2+ ‐doped CsMgI 3 and CsSrI 3 displayed a redshift emission with respect to Eu 2+ ‐doped CsCaI 3 perovskite. Eu 2+ ‐doped CsMgI 3 crystallizes in a distorted hexagonal CsNiCl 3 structure whereas CsCaI 3 crystallizes in an orthorhombic GdFeO 3 structure and CsSrI 3 crystallizes in a filled PuBr 3 structure …”

“…The divalent rare earth Eu 2+ ‐based perovskite (C 4 H 9 NH 3 ) 2 EuI 4 has been synthesized through low‐temperature solid‐state reactions . The effect of doping of rare earth metal ions such as Eu 2+ , Tm 2+ , and Yb 2+ in CsAX 3 (A‐Ca,Mg,Sr) perovskite has been investigated extensively . Another transition metal gold has been investigated for its potential in a perovskite framework.…”

“…whereas CsCaI 3 crystallizes in an orthorhombic GdFeO 3 structure and CsSrI 3 crystallizes in a filled PuBr 3 structure. [280] The divalent Ca 2+ has an ionic radius (100 pm) comparable to that of Pb 2+ (119 pm) [281,282] whereas Sr 2+ (118 pm) has a similar ionic radii to Pb 2+ (119 pm). [283] The divalent Ba 2+ has an ionic radii of 135 pm larger than that of Pb 2+ (119 pm).…”

“…[290] The effect of doping of rare earth metal ions such as Eu 2+ , Tm 2+ , and Yb 2+ in CsAX 3 (A-Ca,Mg,Sr) perovskite has been investigated extensively. [280,291,292] Another transition metal gold has been investigated for its potential in a perovskite framework. The optical properties of gold-based 2D organic mixed Au I /Au III [293] Another transition metal tellurium-based vacancy order perovskite Cs 2 TeI 6 has been reported that consists of a face-centered lattice of [TeI 6 ] 4− units with Cs 2+ cations occupying the cuboctahedral position.…”

Photoluminescence properties of Yb2+ ions doped in the perovskites CsCaX3 and CsSrX3 (X = Cl, Br, and I) – a comparative study

“…These compounds may be interesting as an experimental standard for theoretical models of the electronic structure of Yb 2+ and as potential novel scintillators in accordance with the respective Eu 2+ -doped compounds. [44][45][46][47][48][49] The photoluminescence properties of Eu 2+ have already been reported in these compounds [44][45][46][47][48][49][50][51][52] which also allows a comparison between the spectroscopic properties of both divalent lanthanides. All starting materials were pre-dried in a dynamic vacuum at 200 1C overnight, respectively, to remove all water contents.…”