Blue Emitting Single Crystalline Assembly of Metal Halide Clusters

Abstract

The rich chemistry of organic-inorganic metal halide hybrids has enabled the development of a variety of crystalline structures with controlled morphological and molecular dimensionalities. Here we report for the first time a single crystalline assembly of metal halide clusters, (CNH)(PbCl)PbCl, in which lead chloride tetrahedrons (PbCl) and face-sharing lead chloride trimer clusters (PbCl) cocrystallize with organic cations (CNH) to form a periodical zero-dimensional (0D) structure at the molecular level. Blue light emission peaked at 470 nm with a photoluminescence quantum efficiency (PLQE) of around 83% was realized for this single crystalline hybrid material, which is attributed to the individual lead chloride clusters. Our discovery of single crystalline assembly of metal halide clusters paves a new path to functional cluster assemblies with highly tunable structures and remarkable properties.

Hybrid Metal Halides with Multiple Photoluminescence Centers

“…Based on Equation (1), the effective decay times were calculated to be 27.43 ns of band 1 and 114.26 μs of band 2. The short nanosecond lifetime for band 1 is consistent with other Pb‐based halides with STE emission . The long lifetime for band 2 is ascribed to 4 T 1 to 6 A 1 transition of tetrahedrally coordinated Mn 2+ with spin‐forbidden transitions.…”

A Lead‐Free All‐Inorganic Metal Halide with Near‐Unity Green Luminescence

“…Problems, such as toxicity, expensive vacuum‐based processing, high defect density faced by conventional LEDs, e.g., organic LEDs [ 1 ] and quantum dot LEDs [ 2 ] pose a challenge to cost‐effective large‐scale commercial application, urging people to explore new emissive species for the next‐generation light‐emitting diodes. During the past few years, lead halide perovskites have received considerable attention as a promising candidate owing to their remarkably high photoluminescence quantum efficiencies (near‐unity for blue, green, and red light‐emission), [ 3–5 ] low defect density as well as potential to be made at low cost via facile solution processing. [ 6–10 ] So far, the record of the external quantum efficiency of green LEDs based on lead halide perovskites has surpassed 20%, [ 11 ] approaching the performance of organic LEDs.…”

Three‐Dimensional Cuprous Lead Bromide Framework with Highly Efficient and Stable Blue Photoluminescence Emission

“…[9a, 17] Here, it is noteworthy that although substantial achievements of blue emission have been realized in nanocrystalline or metal-doping CsPbX 3 QDs, very rare new type of crystalline hybrid halide has been reported as blue emitter (Table S1). [18] The blue emission of [(NH 4 ) 2 ]CuPbBr 5 features a full-width at half-maximum (FWHM) of 107 nm and Stocks shift of 160 nm (Table 1). The corresponding Commission Internationale de lEclairage (CIE) chromaticity coordinate is calculated to be (0.16, 0.16) (Figure 2 c).…”