Siloxy Group-Induced Highly Efficient Room Temperature Phosphorescence with Long Lifetime

Masaki Shimizu, Ryosuke Shigitani, Masaki Nakatani, Keiko Kuwabara, Yusuke Miyake, Kunihiko Tajima, Hayato Sakai, Taku Hasobe

研究成果: Article査読

57 被引用数 (Scopus)

抄録

The design and development of organic phosphors that exhibit efficient emission at room temperature but do not contain precious metals such as iridium and platinum have attracted increasing attention. We report herein highly efficient green phosphorescence-emitting 1,4-dibenzoyl-2,5-bis(siloxy)benzene crystals in air at room temperature. Remarkable luminescence quantum yields of 0.46 to 0.64 and long lifetimes ranging from 76.0 to 98.3 ms were observed. X-ray diffraction analysis of the single crystals revealed that there were several intermolecular interactions causing suppression of intramolecular motion, thereby minimizing nonradiative decay of the triplet excited state. Comparison with the corresponding 2,5-bis(dimethylphenylsilylmethyl) and 2,5-bis(trimethylsilyl) derivatives revealed that the siloxy groups are essential for efficient room temperature phosphorescence. Density functional calculations suggested that σ-n conjugation was operative in the siloxy moieties. Electron spin resonance measurement indicated that the radiative process included generation of the triplet diradical species, whose electron distribution was very similar to that of naphthalene. The present study largely expands the possibilities for the molecular design of precious metal- and halogen-free organic phosphors exhibiting efficient room temperature phosphorescence.

本文言語English
ページ(範囲)11631-11639
ページ数9
ジャーナルJournal of Physical Chemistry C
120
21
DOI
出版ステータスPublished - 2016 6 2

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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