【助成 39 - 14】

有機合成に頼らない有機 EL 材料開発：
アントラセン発光体分子のナノ空間閉じ込めによる発光色変調研究者 東京大学大学院工学系研究科 助教
代表研究者

岸本 史直

〔研究の概要〕The development of light-emitting materials that exhibit a variety of luminescent colors is being vigorously
studied for a broad range of applications such as solar energy utilization. This project demonstrated thatphotoluminescence of the unsubstituted anthracene confined in zeolites was drastically affected by the zeolite
topology, Si/Al ratio of the host zeolite, and the acidity of the solvent used for the anthracene introduction,
resulting in ultrapure blue and white emission from 2DA confined in MOR and FAU zeolites, respectively.

respective light-emitting molecules that emit the three〔研究経過および成果〕
The development of pure-blue and single-white

primary colors of light, but it is further difficult tolight emitters is considered very significant for thecreate ideal conditions due to phase separation anddevelopment of full-color light-emitting devices.

cohesive quenching.

Various polycyclic aromatic hydrocarbons (PAHs),

Strong confinement of luminescent molecules ormainly anthracene and pyrene rings, have been

metal clusters into angstrom-sized nanospace is anreported as pure-blue emitters. However, because thealternative strategy for controlling luminescencemethods used to synthesize these PAHs are very

behavior without complex organic synthesis. The

complex, alternative green methods are needed from a

confinement of small molecular PAHs in micropores

green

such as zeolites can be proposed as a promisingchemistry

perspective.

Indeed,white

light-emitting devices can be obtained by mixing themethodfor

highlyobtainingcolor-rendering

Fig. 1. Scheme of 2-dehydride-anthracene incorporation in MOR zeolite (2DA@MOR) synthesis via
deamination of 2AA already introduced in the microcavity.

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luminescent materials without complex organicの開発」、ゼオライト、38, 52 (2021).

synthesis.

２． F. Kishimoto, K. Hisano, K. Iyoki, T. Wakihara, T.

In this paper, we have integrated unsubstituted

Okubo, Stable ultrapure blue and white emission

anthracene molecules in the nanocavity of Al-richfrom unsubstituted anthracene confined in zeolites,

zeolites via ab-intra zeolite catalyzed deamination ofunder evaluation.

anthrylammonium cation already introduced in thezeolite cavity, which is an application of ourpreviously

reported

introduction

techniqueofunsubstituted anthracene into layered clay minerals.
Figure 1 shows the schematic image of theliquid-phase introduction of unsubstituted anthracene
into the microcavity of proton-type mordenite(H+MOR) zeolite using 2-aminoanthracene (2AA) as aprecursor. The introduced 2AA was protonated by theFig. 2. Emission and excitation spectra of 2DA@MOR

protonsa(Si/Al = 7.9) synthesized in EtOH/HCl mixed solvent.

2-anthrylammonium cation. Subsequently, acidic sites

Inset shows the photograph of the particulate sampleof zeolite induce catalytic deamination for cleaving

under 365 nm light irradiation.

inthezeolite

cavitytoformthe C–N bond of intercalated 2-anthrylamm onium togenerate 2-dehydride-anthracene (2DA) in the zeolite
cavity. The addition of mineral acid such ashydrochloric acid in the solution of 2AA introduction
induces the formation of extra-framework aluminum(EFAL) species in the cavity to some extent
simultaneously occurring with the confinement of the2DA. Photoluminescence of the 2DA was drasticallyaffected by the zeolite topology, Si/Al ratio of the hostzeolite, and the acidity of the solvent used for 2AA
introduction, resulting in ultrapure blue and whiteemission from 2DA confined in MOR (Fig. 2) andFig. 3. Emission spectrum and a lifetime of

FAU zeolites (Fig. 3), respectively.

2DA@FAU (Si/Al = 250) synthesized in EtOH/HCl〔発表論文〕

mixed solvent. Inset shows the photograph of the１． 岸本史直、「ナノ空間を利用した光機能性材料

particulate sample under 365 nm light irradiation.

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