Light-Emitting Diodes with Manganese Halide Tetrahedron Embedded in Anti-Perovskites

Abstract

The formability of antiperovskite [MX4]­XA3-type (A­(I) = alkali metals; M­(II) = transition metals; X = Cl, Br, I) can be predicted by building the analysis theory. To validate the prediction model, a series of cesium–manganese antiperovskite single crystals with different halogen mixing ratios were synthesized, which not only have [MX4]­XA3-type structures but also are ideal luminescent materials. As the most pure green emission fluorescent antiperovskite, [MnCl2Br2]­BrCs3 shows 520 nm emission with the high photoluminescence quantum yield (93.5%) at room temperature and ultrastable luminescent color from 77 to 523 K due to the strict confinement of high-density luminescent centers. By fabricating the perovskite film with the double-source thermal evaporation method, the first all-inorganic cesium–manganese halide antiperovskite light-emitting diode is reported, with maximum external quantum efficiency up to 12.5%, maximum luminance up to 3990 cd m–2, and half-life of 756 min operated at 5.0 V.

2D‐Layered Manganese Perovskite with High Mobility

“…These energy bands correspond to the following energy levels: 6 A 1g ( 6 S) → 4 T 1 (P), 6 A 1g ( 6 S) → 4 E g (D), 6 A 1g ( 6 S) → 4 T 2g (D), 6 A 1g ( 6 S) → 4 A 1g 4 E g (G) and 6 A 1g ( 6 S) → 4 T 2g (G). [ 52,54 ] According to the crystal field theory, these characteristic peaks and energy levels are the Mn (II) absorption (Figure 2b). The D q /B values (where B is Racah parameter and D q is crystal field crystal field stability energy) calculated from Figure 2b are 2.22 and 1.09 for K 2 MnCl 2 Br 2 and K 2 MnCl 2 I 2 , respectively.…”

“…At the same time, there are many reports in the literature that manganese, selenium, germanium, silver, and bismuth perovskite materials show great potential properties, which provides a promising way to avoid the environmental problem caused by using lead. [ 44–52 ] Here, we adopt a synthesis method reported by Biswas for 2D manganese perovskites that is different from the two common methods aforementioned. [ 53 ] We use different halogen elements as a spacer molecule to prepare a 2D layered perovskite, which not only has a layered structure and special electrical properties but also maintains the crystal structure of bulk perovskite.…”

Temperature-Dependent Photoluminescence of Manganese Halide with Tetrahedron Structure in Anti-Perovskites

“…For example, the measurement of excitation spectra is necessary to know the involved excitons with different energy states and different radiative recombination rates. In our previous work [19], we measured the excitation spectra of a series of [MX 4 ] tetrahedral perovskites with different halogen elements. The wavelength range of the pumping light was 250~480 nm.…”

“…This unique structure can effectively reduce the interaction degree of luminescence centers and increase the spatial constraint effect so that these materials have high PLQY and luminescence color stability. Yan et al [19] prepared perovskite thin films by using the double-source thermal evaporation method, and prepared the first all-inorganic cesium manganese halide anti-perovskite light-emitting diode, with a maximum external quantum efficiency of 12.5%, maximum luminous brightness of 3990 cd/m 2 , and half-life of 756 min at 5.0 V.…”

Stable Luminous Organic–Inorganic Hybrid Manganese Halide Nanostructures for Light-Emitting Diodes

“…As a potential green-emission material, manganese halide tetrahedrons coordinated with an organic ligand have attracted researchers for several years. − The synthesis proceeds at room temperature under moderate conditions compared with other luminescent materials (hot injection for perovskite quantum dots or high-temperature calcination for phosphors). By tuning the distance of the emission centers, such as the Cr–Cr ion pair, various optical characteristics of luminescent materials can be exhibited .…”