Highly Efficient and Ultralong Afterglow Emission with Anti‐Thermal Quenching from CsCdCl₃ : Mn Perovskite Single Crystals

Abstract

Triplet exciton‐based long‐lived phosphorescence is severely limited by the thermal quenching at high temperature. Herein, we propose a novel strategy based on the energy transfer from triplet self‐trapped excitons to Mn2+ dopants in solution‐processed perovskite CsCdCl3. It is found the Mn2+ doped hexagonal phase CsCdCl3 could simultaneously exhibit high emission efficiency (81.5 %) and long afterglow duration time (150 s). Besides, the afterglow emission exhibits anti‐thermal quenching from 300 to 400 K. In‐depth charge‐carrier dynamics studies and density functional theory (DFT) calculation provide unambiguous evidence that carrier detrapping from trap states (mainly induced by Cl vacancy) to localized emission centers ([MnCl6]4−) is responsible for the afterglow emission with anti‐thermal quenching. Enlightened by the present results, we demonstrate the application of the developed materials for optical storage and logic operation applications.

Multiexciton Generation from a 2D Organic–Inorganic Hybrid Perovskite with Nearly 200% Quantum Yield of Red Phosphorescence

“…Interestingly, the temperature-dependent spectra of PACC and PACC-M exhibit an antithermal quenching phenomenon, which should be related to the shallow trap state in PACC. [16] After the excitation at 269 nm, the exciton can reach 3 E g level from conduction band (CB) through the intersystem crossing (ISC) process, but some of the excitons will be trapped by the shallow trap (Figure 3e). The trapping-detrapping process caused by such traps is thermal behavior, [17] and excitons in the shallow trap can revert to CB under the action of heat.…”

All-Inorganic Zero-Dimensional Sn-Doped Rb4CdCl6 with Near-Unity Quantum Efficiency

“…The introduction of Sn 2+ significantly enhances the PLQY because of a transition from an indirect to direct band gap, whereas the pristine Rb 4 CdCl 6 has a broad indirect band gap. In fact, Cd-based MHPs with unique properties have been widely investigated in the context of doping effects in the recent few months, as the luminescence of Cd-based MHPs can be greatly improved by doping strategies, − which expands the knowledge of the efficient luminescent all-inorganic Cd-based material family with the potential to serve as components for lighting applications. For example, Lin’s group and Yang’s group reported the Mn 2+ -doped orange-emitting CsCdCl 3 with high PLQY, , and Hens’s group developed Sb 3+ -doped Cs 2 CdCl 4 colloidal nanoplatelets by a facile hot injection approach .…”

“…In fact, Cd-based MHPs with unique properties have been widely investigated in the context of doping effects in the recent few months, as the luminescence of Cd-based MHPs can be greatly improved by doping strategies, − which expands the knowledge of the efficient luminescent all-inorganic Cd-based material family with the potential to serve as components for lighting applications. For example, Lin’s group and Yang’s group reported the Mn 2+ -doped orange-emitting CsCdCl 3 with high PLQY, , and Hens’s group developed Sb 3+ -doped Cs 2 CdCl 4 colloidal nanoplatelets by a facile hot injection approach . Although the PLQYs of these materials have been greatly improved after ion doping, there is still a vacancy for Cd-based MHPs in the blue emission.…”

Effect of the Host Lattice Environment on the Expression of 5s2 Lone-Pair Electrons in a 0D Bismuth-Based Metal Halide

“…The doping strategy provides a greater probability of modulating materials’ composition and photophysical properties. − Considering the similar electronic configuration of Bi 3+ (6s 2 6p 0 ) and Sb 3+ (5s 2 5p 0 ) and the identical valence state, the influence of the host lattice environment on the expression of 5s 2 lone-pair electron is explored here. In this work, we first synthesized a Bi 3+ -based halide (C 5 H 14 N 2 ) 2 BiCl 6 ·Cl·2H 2 O that did not show PL at RT.…”