869986-35-6Relevant academic research and scientific papers
Fine tuning the purity of blue emission from polydioctylfluorene by end-capping with electron-deficient moieties
Hung, Ming-Chin,Liao, Jin-Long,Chen, Show-An,Chen, Su-Hua,Su, An-Chung
, p. 14576 - 14577 (2005)
We propose a simple way to achieve pure blue emission and improved device efficiency via capping poly(9,9-dioctylfluorene) (PFO) with electron-deficient moieties (EDMs, such as oxadiazole (OXD) and triazole (TAZ)), which can induce a minor amount of long conjugating length species (regarded as β phase) to control extents of energy transfer from amorphous matrix to the β phase. The device efficiency of PFO end-capped with TAZ is higher than that with para-tert-butyl phenyl (TBP) by a factor of 2 (with CsF/Al as cathode), and its electroluminescent spectrum remains stable and with pure blue emission during cyclic operations (C.I.E. color coordinates x = 0.165, y = 0.076, independent of operating voltage and within the limit for pure blue emission x + y 0.30). The improvement of device efficiency is dependent on the structure of EDM, such as size and planarity. The deep blue emission is originated from the incomplete energy transfer from amorphous matrix to the β phase induced by the end-cappers. Copyright
Based on 4,4 the structure of the- [...][...] 9, the 9-bit [...] a main body material and its application (by machine translation)
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, (2016/10/10)
Based on 4,4 the structure of the- [...][...] 9, the 9-bit [...] a main body material and its application, the present invention discloses a kind HOMO line condition and at the same time has a high level and the main material with excellent performance, its to 4, the 4-bit connected [...][...] as the molecule skeleton structure, in its 9,9 the connecting substituent [...] -position, which can be connected with transmission performance of the cavity diphenylammonium unit Dn, but also can be connected with electronic transmission performance unit An: phosphorusoxychloride unit, sulfur and oxygen unit, in addition to the two special spiral ring-like structure can be formed. The main body material of the present invention synthetic method is simple and easy to operate, which is suitable to be widely used. Main body material by the present invention of the organic electroluminescent light-emitting device is phosphorescent blue light, has high efficiency, high brightness, low efficiency low starting voltage attenuation and electroluminescent performance, can be widely applied to the organic electroluminescent field. (by machine translation)
