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제125회 대한화학회 학술발표회 및 총회 Energy transfer behavior from organic carboxylate sensitizers to Eu3+ activators in layered rare earth hydroxide matrix

2020년 2월 6일 15시 05분 58초
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Material Chemistry
저자 및
Song-ho Byeon*, Yoodong Chang1
Department of Applied Chemistry, Kyung Hee University, Korea
1Applied chemistry, Kyung Hee University, Korea
Layered rare earth hydroxides (LRHs) family, whose general structure is composed of alternate stacking of hydroxocation layers and anion layers, is recently attracting broad attention as a typical layered type inorganic luminescent material. However, intrinsically low efficiency of the parity and spin-forbidden 4f−4f excitation as well as efficient non-radiative emission by interlayer water molecules and hydroxyl groups result in quite low photoluminescence (PL) efficiencies that are not sufficient for the practical applications. One alternative can be the intercalation of organic guests into the gallery of LRH hosts, where the luminescence intensity is markedly enhanced by efficient energy transfer between organic guests and LRH layers. Considering that most of aromatic organic compounds with easily ionizable carboxylic groups absorb UV light, benzoate, phthalate, isophthalate, terephthalate, and naphthoate were intercalated into the interlayer space of Eu-doped layered yttrium hydroxide in the present work. Owing to similar S1 (π, π*) excited state of organic molecule to the resonance energy level of Eu3+ ions, a sensitization of organic carboxylates followed by efficient energy transfer led to highly enhanced photoemission from Eu3+. Such an energy transfer behavior was systematically compared as a function of the number and position of carboxylic groups in the organic sensitizer structure.