Simultaneous Improvement and Tailoring Upconversion and Downshift Luminescence of Cs₂NaErCl₆ via Yb³⁺ Alloying for Versatile Photoelectric Applications

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: March 11, 2025

Lead-free double perovskite (DP) materials have garnered growing interest because of their outstanding optoelectronic attributes. Nevertheless, realizing efficient, multimodal photoluminescence (PL) with adjustable emission spectra within single-host DP still poses a formidable hurdle. Herein, Er-based lead-free DPs (Cs2NaErCl6) were developed, which achieves downshift (DS) emissions from visible to near-infrared (NIR) and multicolor upconversion (UC) emissions, resulting the abundant energy levels Er3+ ions. Alloying Yb3+ introduces new Yb3+-Er3+ cross-relaxation (CR) pathways, leading 308.5-fold increase in DS red achieving maximum color purity 98.63%. Additionally, alloying enhances UC luminescence by 10.8-fold due its strong absorption cross section around 980 nm. The colors can be adjusted altering doping concentration laser power density. Spectral analysis theoretical calculations reveal high compatibility ions Cs2NaErCl6, critical role CR energy-transfer processes tunable, PL. Furthermore, developed been utilized anticounterfeiting, information encoding, narrow-band NIR photodetectors, expanding versatile uses rare-earth (RE)-based optoelectronics field.

Language: Английский

Ultra broadband emission toward white LED based on dysprosium double perovskites CsxRb3-xDyCl6-xIx

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161517 - 161517

Published: March 1, 2025

Language: Английский