Efficient Orange Emission in Mn²⁺-Doped Cs₃Cd₂Cl₇ Perovskites with Excellent Stability

Abstract

Low-dimensional metal halides are attractive for applications in photodetectors, solid-state lighting, and solar cells, but poor stability is an obstacle that must be overcome in commercial applications. Herein, we successfully synthesized a Ruddlesden−Popper (RP)phased perovskite Mn 2+ :Cs 3 Cd 2 Cl 7 with high photoluminescence quantum yield (PLQY) and outstanding thermal and environmental stability by a solvothermal method. The pristine sample Cs 3 Cd 2 Cl 7 exhibits a weak cyan broad emission centered at 510 nm with a low PLQY of ∼4%. Once Mn 2+ ions are introduced into the host lattice, a bright orange emission peaking at 580 nm with a high PLQY of ∼74% was achieved, which is attributed to the efficient energy transfer from the host to Mn 2+ ions and thus results in the 4 T 1 → 6 A 1 radiation transition of Mn 2+ ions. The photoluminescence (PL) intensity and environmental stability of Mn 2+ :Cs 3 Cd 2 Cl 7 can be further improved through A-site Rb alloying. Finally, an orange LED with outstanding color stability was fabricated on the basis of the Mn 2+ :Cs 3 Cd 2 Cl 7 . Our work successfully elucidates that dopant plays an integral role in tailoring optical properties.

Doping/Alloying Pathways to Lead‐Free Halide Perovskites with Ultimate Photoluminescence Quantum Yields

“…Such a combination should strongly accelerate the search for new phosphors, which is currently performed by an Edisonian approach. Nevertheless, we want to highlight the successes of the Edisonian approach as well, evidenced by several new doped LFP emitters reported during the time the present Minireview was peer‐reviewed, in particular, those based on Cs(Rb) 3 Cd 2 Cl 7 ,[ 48 , 49 ] Cs 2 NaYCl 6 , [50] and Cs 2 AgScCl 6 [51] as host matrices.…”

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.…”

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 .…”