A picosecond hard x-ray study of the fluorescence dynamics of anthracene derivatives and 8-hydroxyquinoline complex microcrystals

Hideho Odaka, Toshifumi Miura, Koji Hatanaka, Sabine Wiebel, Hiroshi Fukumura

研究成果: Article査読

3 被引用数 (Scopus)

抄録

A 20 ps pulsed hard X-ray source (4 -15 keV) was utilized for exciting microcrystals of anthracene, 9,10-dichloroanthracene, 9,10-diphenylanthracene tris (8-hydroxyquinoline) aluminum, and bis(8-hydroxyquinoline) zinc, and the generation process of these fluorescence states was studied. It was found that the fluorescence rise time by hard X-ray excitation was much slower than the rise time by UV excitation for all samples. In addition, there was a tendency that molecules including heavier atoms show faster fluorescence rise time and lower fluorescence intensity. It is considered that because the X-ray absorption occurs at the heaviest atom in a molecule to yield a photoelectron which further generates ionized tracks consisting of electron-hole pairs, the amount of the electron-hole pairs leading to fluorescence states would depend on the initial photoelectron energy. The observed fast rise for the molecules including heavy atoms is attributed to the rapid recombination of electron- hole pairs, which may be affected by the initial distance distribution of electron-hole pairs, the density of electron-hole pairs, and the crystal structures.

本文言語English
ページ(範囲)11969-11974
ページ数6
ジャーナルJournal of Physical Chemistry C
113
27
DOI
出版ステータスPublished - 2009 7月 9

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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