title: Reversibly tunable upconversion luminescence by host-guest chemistry.
abstract: Tuning upconversion (UPC) luminescence using external stimuli and fields, as well as chemical reactions, is expected to lead to novel and efficient optical sensors. Herein, highly tunable UPC luminescence was achieved through a host-guest chemistry approach. Specifically, interlayer ion exchange reactions reversibly tuned the emission intensity and green-red color of Er/Yb-codoped A2La2Ti3O10 layered perovskite, where A corresponds to proton and alkali metal ions, enabling the visualization of host-guest interactions and reactions.
authors.affiliation: Graduate School of Science and Technology, Kumamoto University , 2-39-1 Kurokami, Kumamoto 860-8555, Japan.
authors.forename: Takaaki
authors.initials: T
authors.lastname: Taniguchi
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Murakami
authors.forename: Asami
authors.initials: A
authors.lastname: Funatsu
authors.forename: Kazuto
authors.initials: K
authors.lastname: Hatakeyama
authors.forename: Michio
authors.initials: M
authors.lastname: Koinuma
authors.forename: Yasumichi
authors.initials: Y
authors.lastname: Matsumoto