Tunable Bright White Light Emission with Ultra‐High Color Rendering Index Induced by Trigonal Bipyramid Unit

Abstract

Efficient broadband emitting organic–inorganic metal hybrids (OIMHs) have attracted great attention recently as promising single‐component white light emitters. Here a new zero‐dimensional (0D) OIMH (C13H14N)2InCl5 (C13H14N+ = N‐methyldiphenylammonium) is reported, which features unique five‐coordinated [InCl5]2− trigonal bipyramid motif. For the first time, it is demonstrated that the trigonal bipyramid units in 0D OIMH can act as luminescence centers, showing blue emission under UV light. Remarkably, incorporating Sb3+ in [InCl5]2− trigonal bipyramids induces a new dual‐band emission at 540 and 735 nm resulting from the singlet and triplet self‐trapped excitons in [SbCl5]2−, leading to complete coverage of the entire visible spectrum. The resulting emissions in (C13H14N)2InCl5:Sb3+ are tunable from cold to warm white with the correlated color temperatures changing from 5574 to 3473 K and more importantly, an ultra‐high color rendering index (CRI) up to 96 being observed, which is comparable to the highest value in hybrid metal halides. A high photoluminescence quantum yield of 46.26% is simultaneously obtained in this system. This work demonstrates that the 0D OIMH with trigonal bipyramid motif is an excellent system for realizing the single‐component white light emission with both high efficiency and ultra‐high CRI.

Zero-dimensional indium hybrids and modulated photoluminescence by Sb doping

“…To our knowledge, among the reported fivecoordinated In-based OIMHs, only (C 13 H 14 N) 2 InCl 5 shows blue emission with a photoluminescence quantum yield (PLQY) of 5.44%, while (C 20 H 20 P) 2 InCl 5 and (C 6 H 18 N 2 )InCl 5 ÁH 2 O hardly exhibit emission. [12][13][14] Hence, the development of 0D In-based OIMHs with [InX 5 ] 2À square pyramids and higher energy emission is beneficial to enrich the structure and luminescence of indium hybrids.…”

Lead-free hybrid indium perovskites with near-unity PLQY and white light emission using an Sb3+doping strategy

“…electronic configurations has been proven to be an effective strategy for improving photophysical properties. [18][19][20][21] Sb 3+ is an effective dopant used as a non-emitting system to activate photoluminescence (PL) emission due to the unique dynamic lone pair of electrons. 22,23 It is possible to realize efficient luminescence by constructing a host-guest doping system, in which the inert host is doped with a luminescent species.…”

“…electronic configurations has been proven to be an effective strategy for improving photophysical properties. 18–21 Sb 3+ is an effective dopant used as a non-emitting system to activate photoluminescence (PL) emission due to the unique dynamic lone pair of electrons. 22,23…”

Supramolecular-Interactions-Modulated Photoluminescence in Indium Bromide-Based Isomers

“…Over the past few years, researchers have found that zero-dimensional ionic indium-based IOMHs are stable and low-toxicity materials with excellent luminescence properties. − Notably, while possessing organic cations, the anionic indium halide moieties in these ionic IOMHs are mostly pure inorganic such as octahedral (InX 6 ) 3– , conical (InX 5 ) 2– , tetrahedral (InX 4 ) − , , and dimeric (In 2 X 10 ) 4– (X = Cl, Br, I). , As is known, the coordination of organic ligands such as conjugated 2,2′-bipyridal and 1,10-phenanthroline (Phen) into inorganic halometalate units can lead to colorful PL arising from various mechanisms such as halogen-to-ligand charge transfer, ligand-to-metal charge transfer, and inorganic-to-organic charge transfer (IOCT). − Thus, it is anticipated that different combinations of organic ligands and cations can make the PL properties of indium-based IOMHs highly adjustable due to the variety of PL mechanisms and supramolecular interactions inside.…”