Green Triplet Self-Trapped Exciton Emission in Layered Rb₃Cd₂Cl₇:Sb³⁺ Perovskite: Comparison with RbCdCl₃:Sb³⁺

Abstract

Metal halide materials have recently sparked intense research because of their excellent photophysical properties and chemical stability. For example, RbCdCl3:Sb3+ exhibits broad emission at about 600 nm with a high photoluminescence quantum yield (PLQY) over 91% and double emission bands with bright white color. Herein, we obtained a novel Rb and Cd layered perovskite Rb3Cd2Cl7 doped with Sb3+, which gives luminescence at 525 nm with a large Stokes shift of 200 nm, originating from a self-trapped exciton (STE). Its PLQY is 57.47%, but its low-temperature PLQY becomes much higher at the same wavelength. When Rb3Cd2Cl7:Sb3+ and RbCdCl3:Sb3+ were compared, the two classes of quantum confinement effects by Rb and Cd ions in the lattice were identified to describe their electronic states and different optical properties. These results suggest that properties of Sb-doped cadmium halides could be modified by the structure type and local atomic confinement to find applications as promising luminescent materials for optoelectronic devices.

Excitation-Wavelength-Dependent Emission Behavior in (NH4)2SnCl6 via Sb3+ Dopant

“…Such a shift reflected the doped sample has a clear band edge red shift with larger electron–phonon coupling. Considering the typical characteristics of both wide PL bands, large Stokes shifts, and two component lifetimes, the 590 and 734 nm emission bands are all derived from the STE. , Further discussion will be shown in the following section. The property of as shown PL emission from yellow to magenta as the excitation wavelength changes represents a great potential for future dynamic anticounterfeiting of information securities, etc.…”

Orange/cyan emissive sensors of Sb3+ for probing water via reversible phase transformation in rare-earth-based perovskite crystals

“…The results indicate that the introduction of exotic Sb 3+ ions into a low-dimensional crystal lattice of Rb 3 ScCl 6 and Rb 2 ScCl 5 ·H 2 O would significantly decrease the bandgaps by the formation of Sb-s and Cl-p/O-p orbitals between the valence band (VB) and the conduction band (CB). 8,42 Additionally, the electronic states of the valence band maximum (VBM) of the Sb 3+ -doped Rb 3 ScCl 6 crystals are comprised of the Sb-s and Cl-p orbitals and the VBM of Sb 3+ -doped Rb 2 ScCl 5 ·H 2 O comes from the Sb-s, Cl-p, and O-p orbitals from H 2 O. No orbital hybridization between Sb 5s (or 5p) orbitals and Cl 3p (or O 2p) orbitals has been observed in the calculated results from DOS, which is quite different from that in Cs 2 ZrCl 6 :Sb 3+ perovskite crystals.…”

“…To understand the Sb 3+ -induced optical properties and PL mechanism, the charge densities, band structure, and partial densities of states (DOS) of the primitive and Sb 8,42 Additionally, the electronic states of the valence band maximum (VBM) of the Sb 3+ -doped Rb 3 ScCl 6 crystals are com-prised of the Sb-s and Cl-p orbitals and the VBM of Sb 3+ -doped Rb 2 ScCl 5 •H 2 O comes from the Sb-s, Cl-p, and O-p orbitals from H 2 O. No orbital hybridization between Sb 5s (or 5p) orbitals and Cl 3p (or O 2p) orbitals has been observed in the calculated results from DOS, which is quite different from that in Cs 2 ZrCl 6 :Sb 3+ perovskite crystals.…”

Dotierungs‐/Legierungswege zu bleifreien Halogenid‐Perowskiten mit ultimativen Photolumineszenz‐Quantenausbeuten

“…Eine solche Kombination dürfte die Suche nach neuen Leuchtstoffen, die derzeit mit einem Edison-Ansatz durchgeführt wird, erheblich beschleunigen. Nichtsdestotrotz möchten wir auch die Erfolge des Edison-Ansatzes hervorheben, die sich in mehreren neuen dotierten BHP-Emittern zeigen, über die zum Zeitpunkt der Begutachtung dieses Kurzaufsatzes berichtet wurde, insbesondere diejenigen, die auf Cs(Rb) 3 Cd 2 Cl 7 -, [48,49] Cs 2 NaYCl 6 - [50] und Cs 2 AgScCl 6 -Wirtsmatrizen [51] basieren.…”