Uniform nucleation and growth of Cs₃Cu₂I₅nanocrystals with high luminous efficiency and structural stability and their application in white light-emitting diodes

Abstract

Copper-based ternary halides composites have attracted great attention due to their superior chemical stability and optical properties. Herein, We developed an ultrafast high-power ultrasonic synthesis strategy to realize the uniform...

Phase transition and rapid temperature response of lead-free perovskite Cs–Cu–I nanocrystals enabled by their size

“…After that, the excitons in the STE state radiate to the ground state and emit light. 37 The energy difference between Cu( i )-d 10 and Cu( ii )-d 9 creates a large energy gap between the STE and the excited state, which is the main reason for the large Stokes shift. 21,38…”

Bias‐Switchable Dual‐Mode Organic Photodetector with High Operational Stability Using Self‐Trapped Cs3Cu2I5 Interfacial Layer

“…Except for the electrodes, all functional layers were deposited onto the substrate in a consecutive manner via spin-coating using an orthogonal solvent (detailed fabrication procedures presented in SI). Recently, copper-based halide Cs 3 Cu 2 I 5 perovskite with earth abundant composition and superior stability has emerged as a promising lead-free substitute for toxic lead halide utilized in ultraviolet (UV) detectors, [22,23] light-emitting diodes, [24,25] and X-ray scintillators. [26,27] Besides non-toxicity, according to the spectroscopic results displayed in Figure 1b, Cs 3 Cu 2 I 5 QDs absorb UV light with absorption edge center at 290 nm, which is complementary to the standard solar spectrum.…”

Fine Purification Engineering Enables Efficient Perovskite QLEDs with Efficiency Exceeding 23%

“…High photoelectric performance and high stability are the keys to the application of PeQDs. − During the synthesis of PeQDs, their performance is subject to the nucleation and growth process, crystal structure, defect state, and surface ligand characteristics. − On the nucleation growth process, many studies are focusing on. ,− By changing the reaction pathway, controllable nucleation and growth of perovskite QDs have been achieved. Combined with in situ absorption spectroscopy, the dynamic characteristics of PeQDs’ crystal growth have been revealed. , For the control of crystal structure, the doping strategy of components or elements provides a very rich managing effect on the optical band gap, luminescence behavior, carrier dynamics, and QLEDs’ performance. , Afterward, the types of surface ligands outside of PeQDs, including long chain, short chain, and ligands with special photoelectric properties, have a huge impact on their photoelectric properties. − However, for PeQD-based QLED, not only the type of surface ligands, but also the number of ligands will dominate the carrier transport and radiative recombination efficiency inside the device. − Thus, the purification process after synthesis is crucial, will directly affect the PeQDs’ ligand state and crystal structure, and even redefine their photoelectric properties.…”