Anti‐Solvent Synthesis of Three‐Color Indium‐Based Halide Perovskite Microplate/Microcrystal Phosphors for High Color Rendering WLEDs

Abstract

Lead‐free halide perovskites are emerging as promising eco‐friendly candidates for next‐generation solid‐state lighting because of their nontoxicity and availability for broad emission. Herein, a modified room‐temperature anti‐solvent precipitation method is developed to synthesize the Sb3+‐doped, In‐based, lead‐free halide perovskites in microplate/microcrystal structure with different emission colors. The layered structure of InCl3 serves as the template for the growth of Cs2InCl5(H2O):Sb3+ microplate phosphors. Moreover, the presence of HCl not only improves the solubility of precursors, but also provides the acid etching effect. The resultant Sb3+‐doped Cs2InCl5(H2O) microplate phosphors show bright yellow emission with photoluminescence quantum yield up to 92.4%. Furthermore, Cs3InCl6:Sb3+ and Cs2NaInCl6:Sb3+ are synthesized through the similar method, which displays the bright green and deep‐blue emission, respectively. Subsequently, the proof‐of‐concept white light‐emitting diodes (WLEDs) are fabricated based on Cs2NaInCl6:Sb3+ + Cs2InCl5(H2O):Sb3+ and Cs2NaInCl6:Sb3+ + Cs3InCl6:Sb3+ + Cs2InCl5(H2O):Sb3+ phosphors, which achieves high‐quality white light with the color rendering index (CRI) of 91.6 and 95.4, respectively. The results greatly advance the development of lead‐free halide perovskite phosphors synthesis, which may offer new possibilities for high CRI WLEDs fabrication.

Inorganic Salt Solution Assisted Grinding Synthesis of Stimuli-Responsive Perovskites for Reversible Information Encryption and Decryption Based on I Ching 64 Hexagrams

“…Figure g and h show the element mapping images, and all elements distribute with uniform form, matching well with the HRTEM images, which proves the existence of Cs + , K + , In 3+ , Sb 3+ , and Cl – ions in these two compounds. The performances of PLE and PL should also be considered as significant indices, as shown in Figure c and f. Fortunately, the luminescence mechanism of Sb 3+ -doped perovskite has been extensively studied. ,− The luminescence in Cs 2 In 1– x Sb x Cl 5 ·H 2 O and Cs 2 KIn 1– x Sb x Cl 6 is due to the triplet self-trapped excitons (STEs) of Sb 3+ ions . Thanks to the electronic configuration of Sb 3+ ions in the ns 2 configuration, two distinct absorption peaks are displayed in the 300–400 nm ( 1 S 0 – 1 P 1 , 1 S 0 – 3 P 1 ) range and an additional peak at 295 nm ( 1 S 0 – 3 P 2 ), indicative of the dynamic Jahn–Teller distortion in the excited state .…”

Sb3+/Mn2+ co-doped lead-free Cs2KYCl6 perovskites for white light-emitting diodes

“…In this work, high-quality Sb 3+ /Mn 2+ co-doped Cs 2 KYCl 6 MCs have been achieved via a modified anti-solvent precipitation method. 37 In the first stage, we prepared the mother solution by dissolving Cs (ac) (1% mmol), Y (ac) (0.5% mmol), and K (ac) (1% mmol) in a small container containing a mixture of (C 2 H 4 O 2 ) (6 mmol) and (HCl) (1 mmol) and continued heating at 70 °C, followed by stirring for 10 minutes. On the other hand, an anti-solvent solution was prepared by dissolving different ratios of Sb 3+ and Mn 2+ in 6 ml of acetonitrile (CH 3 CN) to synthesize different concentrations of Sb 3+ /Mn 2+ -doped Cs 2 KYCl 6 double perovskite MCs.…”

A zero-dimensional hybrid copper(i) bromide single crystal with highly efficient green emission

“…9,10 The development of lead-free perovskites, achieved by substituting Pb 2+ with nontoxic or less toxic ions such as In 3+ , Sn 2+ , Sb 3+ , Bi 3+ , Mn 2+ , Zn 2+ , and Cu + , is a valid approach. [11][12][13][14][15][16][17][18][19][20] Although the substitution of metal ions may result in metal halides with a non-perovskite structure, these new halides can also exhibit optical and electronic properties that are comparable, or even superior, to those of lead halides. Among these alternatives, cuprous-based halides have garnered increasing attention as a new class of luminescent materials due to their facile solution processing, abundant structural diversity, and non-toxicity, as well as their excellent photoluminescence (PL) properties.…”