Stable yellow light emission from lead-free copper halides single crystals for visible light communication

Solvent-Free Grinding Synthesis of Hybrid Copper Halides for White Light Emission

“…Because of their large Stokes shifts, broadband emissive range, and nontoxicity, lead-free metal halides (LMHs) have been considered as potential candidates for efficient emitters in WLEDs. − Among a variety of LMHs, copper halides have received a lot of attention due to their outstanding optoelectronic properties induced from the formation of self-trapped excitons (STEs), including negligible self-absorption and broadband emission. ,− They may facilitate high efficiency and high color rendering index (CRI) values of as-fabricated WLEDs. Huang et al synthesized stable CsCu 2 I 3 perovskite single crystals with an emission peak of 568 nm and a photoluminescence quantum yield (PLQY) of 15.7% via an antisolvent infiltration method .…”

Synthesis of Thermally Stable and Highly Luminescent Cs5Cu3Cl6I2 Nanocrystals with Nonlinear Optical Response

“…[33] In addition, Cs 3 Cu 2 I 5 displayed a broad emission band with a large Stokes shift, which are characteristics of STEs that are primarily seen in Cu(I)-based fluorescence. Following the initial Cs 3 Cu 2 I 5 study, analogs such as CsCu 2 X 3 and Cs 3 Cu 2 X 5 (X = Cl, Br, I) were synthesized, both in the bulk and as nanocrystals (NCs), [34][35][36][37][38][39][40][41][42] and in-depth analyses of their photophysical properties [43] -as well as studies on various applications, from scintillators to light-emitting diodes [44][45][46] were also carried out.…”

“…Recently, Cu‐based metal halides have gained popularity due to their low toxicity, high stability, and unique PL process mediated by self‐trapped excitons (STEs). [ 1,33–65 ] STEs are formed during a process in which excitons are trapped in a local potential minima generated by the distorted lattice upon photoexcitation, typically in soft ionic crystals with strong electron–phonon interactions. [ 66–70 ] Since exciton localization is an effective strategy to promote radiative recombination, various methods to achieve this have been reported, such as quantum well formation based on core–shell structures, [ 71–74 ] lattice periodicity reduction via doping, [ 75 ] and morphological control to enhance the effects of quantum confinement.…”

Blue Light Hazard Optimization for White Light‐Emitting Diode of Mn2+‐Activated 0D Cs3Cu2Br5 Perovskite Materials

“…[ 23 ] In particular, Cu‐based non‐toxic zero‐dimensional perovskite‐like derivatives Cs 3 Cu 2 X 5 (X = Cl, Br, I) with self‐trapped exciton photo‐luminescence demonstrate some excellent characteristics including broad emission spectrum, large exciton binding energy, strong photo‐luminescence, high photoluminescence quantum yield (PLQY), and tunable emission wavelength, which have made outstanding contributions in the field of optoelectronics, and are deemed to be the most promising lighting materials for the next generation. [ 24–38 ]…”

“…[23] In particular, Cu-based non-toxic zero-dimensional perovskite-like derivatives Cs 3 Cu 2 X 5 (X = Cl, Br, I) with self-trapped exciton photo-luminescence demonstrate some excellent characteristics including broad emission spectrum, large exciton binding energy, strong photoluminescence, high photoluminescence quantum yield (PLQY), and tunable emission wavelength, which have made outstanding contributions in the field of optoelectronics, and are deemed to be the most promising lighting materials for the next generation. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] However, in the commercial application of light-emitting diodes (LED), perovskite-like derivatives Cs 3 Cu 2 X 5 (X = Cl, Br, I) are limited by a narrower spectral emission in the visible spectrum. In order to extend the spectrum of Cs 3 Cu 2 X 5 (X = Cl, Br, I) under ambient conditions, several chemical elements doping have been conducted.…”