Organic photonic and sensing devices based on fluorene-cored oligomers
Date Issued
2007
Date
2007
Author(s)
Lin, Hao-Wu
DOI
en-US
Abstract
Thin films of organic semiconductors have been subjected to extensive studies in the last two decades due to applications in photonics and optoelectronics. In this thesis, we investigate various optoelectronic devices based on fluorene-cored oligomers.
In the first part of the works, we employed two fluorene-cored oligoaryls, which are found to be an efficient donor-acceptor pair in the active organic layer of ultraviolet photodetectors. The devices exhibit high external quantum efficiency and high visible blindness.
In the second part of the works, we studied the optical properties of oligofluorene vacuum-deposited thin films and found that they show high optical anisotropy but become optical isotropic after annealing at a temperature around the glass-transition temperature. The results indicate the molecular reoriention in thin films after annealing. Using this property, we investigated the influence of molecular orientation on stimulated emission properties of organic thin films. Employing such properties, we have also demonstrated continuous tuning of the stimulated emission wavelength of a slab waveguide within one sample.
Finally, we employed the oligofluorene thin film for oxygen sensing. The material itself exhibits moderate sensitivity and fast response. The sensitivity can be further enhanced using stimulated emission of the thin films.
Subjects
有機半導體
有機雷射
氧氣偵測器
光學不等向性
organic semiconductor
organic laser
oxygen sensor
optical anisotropy
Type
thesis
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