Double passivation of alkali metal ion and organic ligand towards enhanced photoluminescence and stability of Cs3Cu2X5 (X Cl, Br and I) nanocrystals

Green synthesis of highly stable CsPbBr3 perovskite nanocrystals using natural deep eutectic solvents as solvents and surface ligands

“…In recent years, perovskite nanocrystals (PNCs) have received much attention because of their excellent optoelectronic properties, such as narrow full width at half-maximum (FWHM), high photoluminescence quantum yield (PLQY), low exciton binding energy, tunable band gap, and low defect density. [1][2][3] They show great potential for application in the fields of light-emitting diodes (LED), 4,5 solar cells, 6-8 lasers 9 and photocatalysis. [10][11][12] Currently, the most common synthesis methods for PNCs are the hot-injection method 13 and the ligand-assisted reprecipitation (LARP) method.…”

Potassium-regulated lead-free cesium copper iodide Cs3Cu2I5 perovskites with enhanced scintillation properties and their application in high-resolution X-ray imaging

“…Considering that no obvious (optical or structural) benefit could be obtained from the above strategies, alkali metal-ion doping can be an attractive approach because it can not only modify the local field strength of the crystal without changing the host crystal structure but also reduce the non-radiative recombination paths. 35–38 In 2022, Xiang et al 35 investigated the effect of Li + doping on the optical and scintillation properties of Cs 3 Cu 2 I 5 under 137 Cs irradiation for the first time, and found that the Li + -doped Cs 3 Cu 2 I 5 single crystal presented an optimized PLQY of 88.6%, scintillation light yield (LY) of 26 000 pho per MeV (2.5 at% Li), and energy resolution of 5.25%@662keV, FWHM (1 at% Li). However, the performance improvement was not very significant relative to pure Cs 3 Cu 2 I 5 (PLQY 83.4%, LY 23 000 pho per MeV).…”

“…In addition, K-OA has also been shown to improve the PLQYs and the stability of Cs 3 Cu 2 X 5 (X = I, Br, Cl) as a passivating agent and ionic dopant, and is considered to be an effective fluorescence enhancing impurity. 28,36 Although several measures have been adopted for improving the PLQYs of Cs 3 Cu 2 l 5 powders, single crystals, and thin films, their light yield is still far below the theoretical limit, which seriously hinders their application in cost-effective and high-resolution flexible X-ray detection. 33,39,40 Furthermore, less research has focused on the effect of K + doping on the scintillation properties of Cs 3 Cu 2 l 5 to date.…”

Stability Optimization of 0D Cs3Cu2Cl5 Single Crystal with High Green Emission for Optoelectronics

“…These properties are significant in the field of optoelectronics, thereby rendering 0D lead-free metal halide perovskites the most promising next generation lighting materials. [10][11][12][13][14][15][16][17][18][19][20][21][22][23] Cs 3 Cu 2 Cl 5 is widely used in photoelectric applications, including light-emitting devices (LEDs), [24] X-ray detection, [25] sensors, [26] high-resolution X-ray imaging, [27,28] and light communications. [29] Despite being a novel photoelectric material, Cs 3 Cu 2 Cl 5 has received limited attention compared with Cs 3 Cu 2 I 5 , because of the challenges in 1) obtaining large bulk single crystals and 2) its instability in the atmosphere.…”