High-Efficiency Light-Emitting Diodes of Organometal Halide Perovskite Amorphous Nanoparticles

Abstract

Organometal halide perovskite has recently emerged as a very promising family of materials with augmented performance in electronic and optoelectronic applications including photovoltaic devices, photodetectors, and light-emitting diodes. Herein, we propose and demonstrate facile solution synthesis of a series of colloidal organometal halide perovskite CH3NH3PbX3 (X = halides) nanoparticles with amorphous structure, which exhibit high quantum yield and tunable emission from ultraviolet to near-infrared. The growth mechanism and photoluminescence properties of the perovskite amorphous nanoparticles were studied in detail. A high-efficiency green-light-emitting diode based on amorphous CH3NH3PbBr3 nanoparticles was demonstrated. The perovskite amorphous nanoparticle-based light-emitting diode shows a maximum luminous efficiency of 11.49 cd/A, a power efficiency of 7.84 lm/W, and an external quantum efficiency of 3.8%, which is 3.5 times higher than that of the best colloidal perovskite quantum-dot-based light-emitting diodes previously reported. Our findings indicate the great potential of colloidal perovskite amorphous nanoparticles in light-emitting devices.

Low‐Dimensional Perovskites: From Synthesis to Stability in Perovskite Solar Cells

“…[60,61] Also, a solution method has been used to synthesis a series of colloidal organometal halide perovskite amorphous NPs structures that were reported by Xing et al using various precursor solutions with a variety of solvents (Figure 2). [62] They proposed four different solvent precursor solutions: (i) N,N-Dimethylformamide (DMF) and γ-butyrolactone (v/v: 17:1) and OLA (1.67 µL mL ), (iii) DMF and OLA (1.67 µL mL −1 ), and (iv) DMF and γ-butyrolactone (v/v: 1:17), where DMF and γ-butyrolactone are used as solvent and antisolvent, respectively. From their study, several conclusions can be made: (i) with the presence of γ-butyrolactone, perovskite networks exist in DMF as a corner-shared octahedral soft framework.…”

Unveiling the Nature of Charge Carrier Interactions by Electroabsorption Spectroscopy: An Illustration with Lead-Halide Perovskites

“…[4] The term perovskite originally designated calcium titanate CaTiO 3 and is now generalized to all compounds that exhibit an ABX 3 crystal structure in the form of corner-sharing BX 6 [5][6][7][8][9][10][11][12][13][14][15][16] Such a wide range of applications implies a wide range of shapes and structure, and, indeed, although mostly exploited in the form of semiconductor thin-films, lead-halide perovskites can be found as nanocrystals or colloidal nanoparticles, retaining their 3D geometry, as well as quantum-confined, 2D or quasi-2D layers.…”

Unconventional solution-phase epitaxial growth of organic-inorganic hybrid perovskite nanocrystals on metal sulfide nanosheets

“…Recently, organic-inorganic hybrid perovskites in the form of colloidal nanocrystals (NCs) have been reported [24,25], and compared to their bulk counterpart, they present a number of advantages such as a high photoluminescence (PL) quantum yield [26], narrow-band emission [27] and shape-dependent PL [28]. These merits make them especially attractive for applications such as solutionprocessed photodetectors [29], light-emitting diodes [30] and solar cells [31]. Unfortunately, colloidal NCs with small lateral sizes suffer from poor film-forming ability, restricting their use in applications where continuous films for charge transporting are required.…”