Ultrastable CsPbBr₃ Perovskite Quantum Dot and Their Enhanced Amplified Spontaneous Emission by Surface Ligand Modification

Abstract

mixture at 150 °C for 2 min and then Cs-oleate solution (0.4 mL in ODE) was quickly injected. After 5 s, the reaction mixture was cooled by the ice-water bath to room temperature.

Methanol-induced fast CsBr release results in phase-pure CsPbBr3 perovskite nanoplatelets

“…[1][2][3][4][5] Showing high photoluminescence (PL) quantum yields (QYs), 6,7 an optimal range of band gap energy values and high defect tolerance, [8][9][10][11] the perovskite nanomaterials hold great promise for solar cell, 12 photodetector, 13 laser, 14,15 light-emitting diode (LED) and display applications. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Being free from the organic component, the all inorganic CsPbX 3 (X À stands for halide ions) perovskites are compositionally stable up to their melting points which are in excess of 460 C, 31 and thus have attracted enormous interest.…”

Stability of Perovskite Light Sources: Status and Challenges

“…c) Photo stabilities of ASE intensity of CsPbBr 3 ‐DA quantum dots (QDs) films. [ 136 ] a) Reproduced with permission. [ 135 ] Copyright 2014, Springer Nature.…”

“…Theoretical calculation showed that ligand loss due to weak surface ligands and QD binding energy lead to the problem of poor long‐term stability. [ 136 ] By employing 2‐hexyldecanoic acid (DA) ligand with shorter chains to substitute OA ligand, Yan et al realized CsPbBr3‐DA QDs films which showed superior colloidal stability and efficient emission. [ 136 ] The synthesized CsPbBr 3 ‐DA QDs which had strong binding energy between DA ligands and QDs could be stored in air for up to 70 d without ligand loss, and films based on it could still output 94.3% of its original photoluminescence intensity after 28 d storage.…”

Automated microfluidic screening of ligand interactions during the synthesis of cesium lead bromide nanocrystals

“…27 Further, Huang et al treated CsPbX 3 nanocrystals with polyhedral oligomeric silsesquioxane and observed enhanced stability in water for several months. 28 In general, long chain surface ligands impede efficient charge recombination, 29 favouring the use of shorter ligands. 23 However, it has been observed that changing the length of the aliphatic chains, and changing the base-acid ratio in the reaction medium yields drastic variations in the size, shape, crystal phase and optical properties of the final products, which can assume varied morphologies including spheres, cubes, plates, sheets, rods, and wires.…”