Super air stable quasi-2D organic-inorganic hybrid perovskites for visible light-emitting diodes

Abstract

Solution processed organic-inorganic hybrid perovskites are emerging as a new generation materials for optoelectronics. However, the electroluminescence is highly limited in light emitting diodes (LED) due to the low exciton binding energy and the great challenge in stability. Here, we demonstrate a super air stable quasi-two dimensional perovskite film employing hydrophobic fluorine-containing organics as barrier layers, which can store in ambient for more than 4 months with no change. The dramatically reduced grain size of the perovskite crystal in contrast to three dimensional (3D) perovskites was achieved. Together with the natural quantum well of quasi-two dimensional perovskite confining the excitons to recombination, the LED exhibited the maximum luminance of 1.2 × 10 cd/m and current efficiency up to 0.3 cd/A, which is twenty fold enhancement than that of LED based on 3D analogues under the same condition.

Highly bright perovskite light-emitting diodes based on quasi-2D perovskite film through synergetic solvent engineering

“…These observations are similar to the conditions of perovskite lms in previous reports. 16,32 The full width at half maximum (FWHM) of the main diffraction peak (14.95 ) increase from 0.66 to 0.81 by introducing DMF in dissolving solvent, revealing the decreased grain size in these lms, which is consistent with the SEM observations. The relative diffraction intensity is much stronger in the perovskite lms with DMF in both dissolving solvent and anti-solvent, partially reecting the enhanced crystallinity in these lms.…”

“…11 The quasi-2D perovskites possess better stability potential than their conventional 3D counterparts, and thus are potential candidates for highly efficient and stable luminescent materials. [11][12][13][14][15] Though the PeLEDs based on quasi-2D perovskites possess high efficiency, the luminance is typically low 9,13,16 (<10 000 cd m À2 for the most efficient PeLEDs based on quasi-2D perovskites 11 ). The low luminance can be ascribed to the severe carrier recombination and inefficient carrier transport inside the solution processed thin lms of quasi-2D perovskites.…”

Recent Progress in Metal Halide Perovskite Micro‐ and Nanolasers

“…As an alternative light harvester material of 3D perovskite, the RP 2D perovskites based solar cells have received a respectable PCE over 12% . Particularly, 2D perovskites have also been demonstrated to exhibit excellent light emission properties with high EQE, which hold good prospect for a range of optical applications . To discern the potentials of optical gain in 2D RPP systems, pure 2D perovskite ( n = 1) served as gain material has been explored since 1998s by Kondo et al The biexciton lasing was only observed in (C 6 H 13 NH 3 ) 2 PbI 4 /Ti‐containing SnO 2 planar waveguide with high excitation densities at 16 K. However, this biexciton lasing remains a debate due to lack of data of beam‐like output and a clear threshold associated with emission intensity and linewidth.…”

The Role of Bulk and Interface Recombination in High‐Efficiency Low‐Dimensional Perovskite Solar Cells

“…In this regard, studies on 2D RPP quantum‐well‐like materials have reported photoluminescence quantum yields (PLQYs) close to 35%, which was achieved by reducing the layer thickness and changing the 2D perovskite constituent ions . As a consequence, RRP materials are also of interest for light emitting diode applications . In order to reveal the charge carrier dynamics and energy transfer through the quantum‐wells, several studies have combined transient absorption (TAS) and transient photoluminescence (TRPL) measurements to study the effect of the different organic spacers and numbers of [PbI 6 ] 4− layers ( n ) .…”