Air‐Stable, Lead‐Free Zero‐Dimensional Mixed Bismuth‐Antimony Perovskite Single Crystals with Ultra‐broadband Emission

Abstract

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.

Lead‐Free Sodium–Indium Double Perovskite Nanocrystals through Doping Silver Cations for Bright Yellow Emission

“…At 77 K, the PL peak becomes narrower and redshifted (Figure S17 b). We consider the similarity of the photophysical properties between Cs 2 NaInCl 6 :Ag DP NCs and reported DP or low‐dimensional perovskite materials, it is reasonable for the broad emission to be attributed to bright STEs state. The PL emission goes from nothing to the bright yellow PL with adding Ag doping ratio from 0 % to 10 % (Figure S18).…”

“…Both the formation process of the STEs for Cs 2 NaInCl 6 NCs and Cs 2 NaInCl 6 :10 % Ag NCs are too fast within the instrument response resolution (ca. 100 fs), demonstrating there is no potential barrier separating the free excitons and STEs . For Cs 2 NaInCl 6 NCs, the PIA decay signal can be fitted by three components: a ultrafast lifetime of τ 1 : 0.5–2.5 ps, a middle lifetime of τ 2 : 5–50 ps and a slow lifetime of τ 3 : >3 ns (Figure c).…”

Lead‐Free Sodium–Indium Double Perovskite Nanocrystals through Doping Silver Cations for Bright Yellow Emission

“…At 77 K, the PL peak becomes narrower and redshifted ( Figure S17 b). We consider the similarity of the photophysical properties between Cs 2 NaInCl 6 :Ag DP NCs and reported DP [29] or low-dimensional perovskite materials, [30,31] it is reasonable for the broad emission to be attributed to bright STEs state.T he PL emission goes from nothing to the bright yellow PL with adding Ag doping ratio from 0% to 10 %( Figure S18). And the PLQE of Ag-doped NCs increases with doping (Figure 3c).…”

“…100 fs), demonstrating there is no potential barrier separating the free excitons and STEs. [30] ForC s 2 NaInCl 6 NCs,t he PIA decay signal can be fitted by three components:aultrafast lifetime of t 1 : 0.5-2.5 ps,amiddle lifetime of t 2 :5-50 ps and aslow lifetime of t 3 : > 3ns (Figure 4c). Thesame decay curves with different excitation energy confirm the fast process is not the Auger combination in either undoped NCs or Ag-doped NCs ( Figure S24).…”

The Rb7Bi3−3xSb3xCl16 Family: A Fully Inorganic Solid Solution with Room‐Temperature Luminescent Members

“…The closest ns 2 -analogue to the Group 14-STE emitters are the trivalent pnictogens (Sb 3+ and Bi 3+ ). [17] While several hybrid organic-inorganic low-dimensional pnictogen halide phases are known, [18] their fully inorganic counterparts,s uch as the A 3 B 2 X 9 (A = Rb,Cs; X= Cl, Br,I)family of compounds and the A 2 B I B III X 6 (A = Rb,C s; B I = Na, Ag;B III = Sb,B i; X= Cl) double perovskites exhibit either no,o rv ery inefficient, RT PL. [19] It was found that Sb 3+ -doped and Bi 3+ -doped structures are photoluminescent at RT,and that these are efficient STE emitters.…”