Lead-free zero-dimensional (0D) organic-inorganic metal halide perovskites have recently attracted increasing attention for their excellent photoluminescence properties and chemical stability.Here,wereport the synthesis and characterization of an air-stable 0D mixed metal halide perovskite (C 8 NH 12 ) 4 Bi 0.57 Sb 0.43 Br 7 ·H 2 O, in whichi ndividual [BiBr 6 ] 3À and [SbBr 6 ] 3À octahedral units are completely isolated and surrounded by the large organic cation C 8 H 12 N + .U pon photoexcitation, the bulk crystals exhibit ultra-broadband emission ranging from 400 to 850 nm, which originates from both free excitons and self-trapped excitons.T his is the first example of 0D perovskites with broadband emission spanning the entire visible spectrum. In addition, (C 8 NH 12 ) 4 Bi 0.57 Sb 0.43 Br 7 ·H 2 Oe xhibits excellent humidity and light stability.T hese findings present an ew direction towards the design of environmentally-friendly,h igh-performance 0D perovskite light emitters.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.
All-inorganic zero-dimensional (0D) metal halides have recently received increasing attention due to their excellent photoluminescence (PL) performance and high stability. Herein, we present the successful doping of copper(I) into 0D Cs 2 ZnBr 4. The incorporating of Cu + cations enables the originally weakly luminescent Cs 2 ZnBr 4 to exhibit an efficient blue emission centered at around 465 nm, with a high photoluminescence quantum yield (PLQY) of 65.3 %. Detailed spectral characterizations, including ultrafast transient absorption (TA) techniques, were carried out to investigate the effect of Cu + dopants and the origin of blue emission in Cs 2 ZnBr 4 :Cu. To further study the role of the A-site cation and halogen, A 2 ZnCl 4 :Cu (A = Cs, Rb) were also synthesized and found to generate intense sky-blue emission (PLQY % 73.1 %). This work represents an effective strategy for the development of environmentally friendly, low-cost and high-efficiency blueemitting 0D all-inorganic metal halides. Low-dimensional metal halides have been widely studied as optoelectronic materials in the past two decades. [1] Zerodimensional (0D) metal halides have recently attracted intense interest due to their high photoluminescence quantum yields (PLQYs) and color tunability. [2] In terms of the 0D structure, various metal halide species, including tetrahedral BX 4 , pyramidal BX 5 , and octahedral BX 6 , have been reported to form highly crystalline materials. [3] Inspiringly, green, yellow and red luminescent 0D metal halides with high PLQYs have been realized in Cu-, Sn-, Sb-and In-based halide single crystals. [4] Nevertheless, blue-emitting 0D metal halides with high efficiency and stability remain challenging. Recently, several lead-free all-inorganic 0D metal halides with high efficient deep-blue emission in short wavelength blue light region (< 460 nm) have been reported. [5] However, all-inorganic 0D metal halides with intense emission in pureblue spectral region (460-480 nm), [6] which are more desirable for display and solid-state lighting, [7] remain largely unexplored. Therefore, it is of great significance to develop environmentally friendly, stable and high-efficiency 0D metal halides with PL peaks located at pure-blue region. Recent studies have demonstrated that doping is an effective strategy for the preparation of highly luminescent and stable metal halides. [8] Among the various alternatives, first row transition metals are of great interest as the majority are inexpensive, earth abundant, relatively nontoxic, and tend to form low-dimensional metal halides. [9] In this work, we chose Cs 2 ZnBr 4 as host and Cu + as the dopant for the 0D all-inorganic, stable, and efficient blueemitting metal halides. By introduction Cu + into the weakly luminescent Cs 2 ZnBr 4 (PLQY % 3.6 %, PL peak % 465 nm), an unprecedented improvement of PLQY (% 65.3 %) was realized without affecting the emission peak position. Detailed spectral characterizations including ultrafast transient absorption (TA) techniques reveal that the bright...
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