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Drastic Photoemission Color Alternation from a Single Molecule as a Starting Material Introduced in Acid-Treated Zeolites: From Pure Blue to White
journal contributionposted on 2023-10-11, 17:27 authored by Fuminao Kishimoto, Kyohei Hisano, Tatsushi Yoshioka, Kenta Iyoki, Toru Wakihara, Tatsuya Okubo
Since high-purity blue- and white-light emitters are an indispensable group of materials for the creation of next-generation optical devices, a number of light-emitting materials have been developed from both inorganic and organic synthetic chemistry. However, these synthetic chemical methods are far from the perspective of green chemistry due to the multistep synthetic process and the use of toxic reagents and elements. Herein, we demonstrate that the introduction of simple unsubstituted anthracenes into zeolite-like pores can create a wide variety of luminescent materials, from ultrapure blue luminescent materials (emission peak at 465 nm with a full width of half-maximum of 8.57 nm) to efficient white luminescent materials [CIE coordination at (0.31, 0.33) with a quantum efficiency of 11.0% under 350 nm excitation light]. The method for rational design of the luminescent materials consists of the following two key strategies: one is molecular orbital confinement of the anthracene molecules in the zeolite nanocavity for regulating the molecular coordination associated with photoexcitation and emission and the other is the interaction of unsubstituted anthracenes with extra-framework aluminum species to stabilize the 2-dehydride anthracene cation in the zeolite cavity.
synthetic chemical methodsstarting material introducedorganic synthetic chemistrymultistep synthetic processmolecular orbital confinementgreen chemistry duegeneration optical devicesframework aluminum speciesmolecular coordination associateddehydride anthracene cationwhite since highsimple unsubstituted anthracenesluminescent materials consistsunsubstituted anthracenesluminescent materialscie coordinationanthracene moleculeswide varietytreated zeolitestoxic reagentssingle moleculerational designquantum efficiencypurity bluepure bluelike poresindispensable groupfull widthemitting materials57 nm465 nm