Manganese-Doped One-Dimensional Organic Lead Bromide Perovskites with Bright White Emissions

Abstract

Single-component white-emitting phosphors are highly promising to simplify the fabrication of optically pumped white light-emitting diodes. To achieve white emission, precise control of the excited state dynamics is required for a single-component system to generate emissions with different energies in the steady state. Here, we report a new class of white phosphors based on manganese (Mn)-doped one-dimensional (1D) organic lead bromide perovskites. The bright white emission is the combination of broadband blue emission from the self-trapped excited states of the 1D perovskites and red emission from the doped Mn ions. Because of the indirect nature of the self-trapped excited states in 1D perovskites, there is no energy transfer from these states to the Mn ions, resulting in an efficient dual emission. As compared to the pristine 1D perovskites with bluish-white emission, these Mn-doped 1D perovskites exhibit much higher color rendering index of up to 87 and photoluminescence quantum efficiency of up to 28%.

Doped Lead Halide White Phosphors for Very High Efficiency and Ultra‐High Color Rendering

“…[12,13] Recently,low-dimensional hybrid metal halides including hybrid perovskites have attracted agreat attention. [14][15][16][17] Their emissions can be extremely broad owing to exciton selftrapping,asoriginally reported by Nagami et al for ahybrid lead iodide. [18,19] Such emission offers rich opportunities for discovering single-phase white light emitters such as Cs 2 AgInCl 6 ,(EDBE)PbBr 4 (EDBE = 2,2'-(ethylenedioxy)bis(ethylammonium)), C 4 N 2 H 14 PbBr 4 ,( AMP)PbBr 5 .1/2H 2 O (AMP = 1-(2-aminoethyl)piperazine), or (TDMP)PbBr 4 (TDMP = trans-2,5-dimethylpiperaziniium).…”

Organic–inorganic metal halide hybrids beyond perovskites

“…Enhanced energy transfer from strongly bounded excitons of the host material to the d electrons of Mn 2+ ions was observed in 2D materials, resulting in its intense orange-yellow emission with a quantum yield of ∼ 37% (Figure 9(d)). Unlike Mn-doped 3D and 2D materials showing dual emission from free exciton and Mn ions, Mn-doped 1D materials was also investigated to show a combined emission from both self-trapped excited states and the doped Mn 2+ ions (Figure 9(e)) [18]. Due to the indirect nature of the self-trapped excited state, there is little-to-no energy transfer from these states to the Mn 2+ ions, resulting in an efficient broadband white emission (Figure 9(f)).…”

“…In an extreme case, when the metal halides are completely isolated by the organic moieties, 0D structure at the molecular level can be obtained to display the intrinsic properties of individual metal halide species [14]. In addition to structure control, doping Mn ions to this class of materials to achieve efficient red emission has been realized in different hybrids [15][16][17][18]. Replacing Pb 2+ by nontoxic trivalent and monovalent metals can yield double perovskites (A 2 B I B III X 6 ), which provides a new route to fabricate lead-free PVs and other optoelectronic devices [19].…”

Efficient and Stable CsPb(Br/I)3@Anthracene Composites for White Light-Emitting Devices

“…26,27 Very recently, single-phase white materials have been reported; these materials emit white light through doping perovskites. 28–30 Nevertheless, these processes are generally complex. 31 …”