Boosting titanate oxide perovskite optical efficiency using dual-cation substitution adjusting sodium-to-lithium ratio at crystal's A-site

https://phys.org/news/2025-12-dual-cation-strategy-boosts-upconversion.html

"triggers structural transition improving energy transfer between rare-earth ions, for increased luminescence intensity/ quantum yield... 32X increased upconversion intensity, 70X increased quantum yield, maintains high thermal/ chemical robustness... phosphors produce bright, tunable green/ blue under 980 nm laser excitation, ideal for: secure anti-counterfeiting (hard to replicate durable labels), solid-state lighting (high-performance, long-lasting LED components) resisting dimming at high temperatures"