Chemical Physics, Journal Year: 2024, Volume and Issue: unknown, P. 112587 - 112587
Published: Dec. 1, 2024
Language: Английский
Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 6, 2025
This study presents the synthesis and characterization of Cs2NaBiCl6 nanocrystals (NCs) doped with varying concentrations In3+ to improve their luminescent properties. Utilizing a colloidal solution method, we systematically varied concentration identify optimal alloying level for enhancing photoluminescence (PL) properties NCs. Structural analysis confirmed that In-alloyed NCs maintained high crystallinity uniform cubic shape. The optical were significantly improved alloying, reaching peak quantum yield (PLQY) at an In/(Bi + In) ratio 0.7. led nearly 2-fold increase in average exciton lifetime 6.98 ns, indicating enhanced self-trapped generation radiative recombination efficiency. Temperature-dependent PL spectra revealed Cs2NaBi0.30In0.70Cl6 exhibited higher binding energy longitudinal phonon compared undoped NCs, suggesting superior thermal stability reduced nonradiative pathways. Density functional theory (DFT) calculations employed elucidate charge density distribution, highlighting significant localization In–Cl Bi–Cl bonds, which is attributed mobility alloyed findings this research not only address limitations current lead-free perovskites but also establish as promising candidate blue light-emitting devices. work advances development environmentally friendly optoelectronic technologies.
Language: Английский
Citations
1
ACS Applied Optical Materials, Journal Year: 2025, Volume and Issue: unknown
Published: March 9, 2025
Language: Английский
Citations
1
Physica B Condensed Matter, Journal Year: 2025, Volume and Issue: unknown, P. 416942 - 416942
Published: Jan. 1, 2025
Language: Английский
Citations
0
Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 2, 2025
Metal halide double perovskites with splendid optical features have been considerably investigated for optoelectronic applications. Herein, a series of Mn2+-doped Cs2NaLuCl6 perovskite crystals were prepared. Via adopting the density functional theory calculation, effect Mn2+ doping on electronic structure compound was discussed. It found that crystal can emit intense blue light from host self-trapped exciton (STE) emission. Excited by 320 nm, STE and emissions simultaneously observed in resulting crystals. Owing to efficient energy transfer Mn2+, polychromatic luminescence final products. Moreover, taking advantage various responses emission intensities temperature, thermometric characteristics investigated, their maximum relative sensitivity is 0.99% K-1, which hardly impacted content. Furthermore, prepared exhibit good X-ray radioluminescence properties, low detection limitation 0.99 μGyair s-1. Additionally, utilizing designed crystal, flexible imaging high resolution 20 lp mm-1 be operated high-temperature environment realized. These results indicated are suitable thermometry imaging.
Language: Английский
Citations
0
Dalton Transactions, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 1, 2025
In this study, tri-cation mixed Cs 2 AgIn 0.85− X Ce Bi 0.15 Cl 6 halide double perovskites exhibiting a higher PLQY and structural stability are reported, which could be effectively incorporated into future white light LED applications.
Language: Английский
Citations
0
Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 16, 2025
Abstract Real‐time, high‐precision X‐ray imaging is of critical importance in a wide range applications, from medical diagnostics to security screening. While lanthanide luminescent materials are among the most commonly used scintillators, achieving combination large‐area scalability, rapid response, and optimal performance remains challenging. Herein, perovskite‐inspired cerium halide nanocrystal scintillator presented with remarkable photoluminescence quantum yield approaching unity fast radiative recombination rate ≈29 ns. By leveraging these promising characteristics, demonstrated spatial resolution 12.21 lp mm −1 an ultra‐low detection limit 11.2 nGy s , alongside applications dynamic imaging. Based on paternal nanocrystals, versatile spectral tunability through alloying cation doping further explored, offering platform for future chemical structural design toward advanced scintillations other down‐conversion applications.
Language: Английский
Citations
0
Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 18, 2025
Abstract Scintillation materials play a significant role in the exploration of extreme space environments and high‐energy physics. Nevertheless, due to prevalence thermal quenching, most traditional scintillators are not capable stable X‐ray imaging at high‐temperature working mode. In this work, Ce 3+ Tb ions successfully co‐doped into Cs 2 NaGdCl 6 double perovskites (DPs) via solvothermal method, exhibiting unusual thermally enhanced scintillation performance. Specifically, radioluminescence intensity :Tb /Ce increases with temperature achieve large ratio 3.67 from 80 500 K. Interestingly, introduction brings dramatic increase thermoluminescence intensity, demonstrating that an increased number deep trap results suppression quenching. At same time, extra occurrence traps can be traced localized octahedral distortions around dopant ions. Moreover, flexible DP‐based film is fabricated by direct coating showing imaging. Ultra‐stable performance over 5 h realized under high 380 K film. The provide regulation strategy for exploring novel high‐performance temperatures.
Language: Английский
Citations
0
Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161093 - 161093
Published: March 1, 2025
Language: Английский
Citations
0
The Journal of Physical Chemistry C, Journal Year: 2025, Volume and Issue: unknown
Published: March 10, 2025
Language: Английский
Citations
0
Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown
Published: March 25, 2025
Abstract Double perovskite halides are attracting considerable attention due to their applications in solar cells and photovoltaics. It is observed that many (more than 20) publications top journals have associated spectral features emission the region at 460–470 nm with “pristine” materials. This leads not only false observations but also incorrect conclusions concerning transformation of dark into bright excitons or boosting self‐trapped exciton (STE) emission. The use phrase STE commented upon. Most commonly, spectra present correspond those antimonate (III) ion, Sb 3+ . should be interpreted terms s p – 2 orbital transitions rather excitonic transitions. compounds Cs NaRECl 6 (RE = Y, Gd) synthesized by two major methods, namely: evaporation hydrothermal syntheses, for various rare earth starting materials, order demonstrate effect antimony contamination. Contamination Mn 2+ ion found samples double susceptible attack moisture. study emphasizes need check sample synthesis purity carefully monitor integrity
Language: Английский
Citations
0