Dokiya Shohei, Ono Yasuyuki, Sasaki Fumio, Hotta Shu, Yanagi Hisao
J Nanosci Nanotechnol. 2016 Apr;16(4):3194-9. doi: 10.1166/jnn.2016.12303.
Organic light-emitting diodes are fabricated by heterojunction of thiophene/phenylene co-oligomer films using biphenyl-capped bithiophene (BP2T) and its cyano-substituted derivative (BP2T-CN). Strong electron-withdrawing cyano-groups in BP2T-CN transform the p-type BP2T into n-type. Photoluminescence and electroluminescence from their bilayered films dominantly result from the BP2T-CN layer since the lying molecular orientation of BP2T-CN facilitates surface emission while the standing orientation of BP2T is not suitable for the device configuration. The current density and electroluminescence intensity are considerably increased by carrier doping with MoO3 and Cs2CO3 into the BP2T and BP2T-CN films, respectively.
有机发光二极管是通过使用联苯封端的联噻吩（BP2T）及其氰基取代衍生物（BP2T-CN）的噻吩/亚苯基共聚物薄膜的异质结来制造的。BP2T-CN中强吸电子的氰基将p型BP2T转变为n型。由于BP2T-CN平躺的分子取向有利于表面发射，而BP2T直立的取向不适合器件结构，因此双层薄膜的光致发光和电致发光主要来自BP2T-CN层。通过分别向BP2T和BP2T-CN薄膜中掺杂MoO3和Cs2CO3进行载流子掺杂，电流密度和电致发光强度显著增加。
