Rational design of a lead-free Cs2Na0.4Ag0.6In0.9Bi0.1Cl6:0.15Mn2+ double perovskite for enhancing the colour rendition index of UV-pumped W-LEDs DOI Creative Commons

D. Balaji,

G. Swati

RSC Advances, Год журнала: 2025, Номер 15(23), С. 18456 - 18466

Опубликована: Янв. 1, 2025

Compared with lead halide perovskites, double perovskites (DPs) have drawn much attention because of their intriguing optoelectronic qualities, environmental stability, and non-toxicity. Herein, we systematically designed a Cs2Na0.4Ag0.6In0.9Bi0.1Cl6:0.15Mn2+ perovskite by alloying Ag+ Bi3+ at the Na+ In3+ sites in host lattice. broke parity forbidden transition Cs2NaInCl6, significantly broadened emission spectra from 450-700 nm. Doping Mn2+ further reduced defect density enhanced radiative recombination. Broad owing to 4T1 → 6A1 ions was observed 665 Upon doping, sample exhibited PLQY 44.9%. Temperature-dependent characteristics synthesized were also studied. Even high temperature 100 °C, intensity only 53%, material possessed activation energy 0.46 eV. The optimised physically blended blue emitting BaMgAl10O17:Eu2+ obtain complete spectral color coverage visible light when excited 365 nm UV source. CIE coordinates (0.37, 0.39), CCT 4457.53 K CRI 87.4 obtained for sample. found be promising luminescent enhancing rendition index UV-pumped white LEDs. as-prepared is multifunctional that can used WLEDs, photodetectors display screens.

Язык: Английский

Anomalously dominating four-phonon scattering in pressure-dependent thermal transport in beryllium oxide DOI

Xiaoyan Bi,

Xinglei Zhang,

J. O. Morales-Ferreiro

и другие.

Applied Physics Letters, Год журнала: 2025, Номер 126(20)

Опубликована: Май 19, 2025

Rocksalt beryllium oxide (BeO) exhibits a unique combination of large bandgap and high dielectric constant, but it is stable only at pressures. While ambient-pressure wurtzite BeO plays crucial role in various applications, its thermal transport properties under pressure remain largely unexplored. Here, we employ the first-principles phonon Boltzmann theory to investigate pressure-dependent BeO. Our results reveal nonmonotonic dependence conductivity, characterized by significant drop upon wurtzite–rock salt phase transition. Furthermore, demonstrate for four-phonon scattering processes, which are typically neglected conventional calculations. Neglecting leads substantial overestimation conductivity. This anomalous dominance can be attributed exceptionally anharmonicity, driven strong repulsive interactions between oxygen atoms, exhibit 1/d4 on interatomic distance. findings emphasize critical importance considering higher-order processes systems. These insights have implications understanding manipulating materials subjected extreme

Язык: Английский

Процитировано

0
Rational design of a lead-free Cs2Na0.4Ag0.6In0.9Bi0.1Cl6:0.15Mn2+ double perovskite for enhancing the colour rendition index of UV-pumped W-LEDs DOI Creative Commons

D. Balaji,

G. Swati

RSC Advances, Год журнала: 2025, Номер 15(23), С. 18456 - 18466

Опубликована: Янв. 1, 2025

Compared with lead halide perovskites, double perovskites (DPs) have drawn much attention because of their intriguing optoelectronic qualities, environmental stability, and non-toxicity. Herein, we systematically designed a Cs2Na0.4Ag0.6In0.9Bi0.1Cl6:0.15Mn2+ perovskite by alloying Ag+ Bi3+ at the Na+ In3+ sites in host lattice. broke parity forbidden transition Cs2NaInCl6, significantly broadened emission spectra from 450-700 nm. Doping Mn2+ further reduced defect density enhanced radiative recombination. Broad owing to 4T1 → 6A1 ions was observed 665 Upon doping, sample exhibited PLQY 44.9%. Temperature-dependent characteristics synthesized were also studied. Even high temperature 100 °C, intensity only 53%, material possessed activation energy 0.46 eV. The optimised physically blended blue emitting BaMgAl10O17:Eu2+ obtain complete spectral color coverage visible light when excited 365 nm UV source. CIE coordinates (0.37, 0.39), CCT 4457.53 K CRI 87.4 obtained for sample. found be promising luminescent enhancing rendition index UV-pumped white LEDs. as-prepared is multifunctional that can used WLEDs, photodetectors display screens.

Язык: Английский

Процитировано

0