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| 題名: | Solution-processed bipolar small molecular host materials for single-layer blue phosphorescent organic light-emitting diodes |
| 作者: | 陳錦地;Lee, Yi-Ting;Chang, Yung-Ting;Lee, Meng-Ting;Chiang, Po-Hsuan;Chen, Chin-Ti;Chen, Chao-Tsen |
| 貢獻者: | 理學院化學學系 |
| 關鍵詞: | Charge transport;Current efficiency;Devices;Energy gap;Organic light-emitting diodes;Oxides;Pyrimidines;Transporting |
| 日期: | 2014-01-14 |
| 上傳時間: | 2026-04-21 14:23:20 (UTC+8) |
| 出版者: | Royal Society of Chemistry |
| 摘要: | 摘要： Three new solution processable small molecular host materials based on the bis-[3,5-di(9H-carbazol-9-yl)phenyl] structural moiety have been developed for blue phosphorescent (FIrpic dopant) organic light-emitting diodes. All three host materials have been characterized as having high glass transition temperatures (T sub(g)s), 155-175 degree C, indicative of good morphological stability of their amorphous thin films prepared from the solution process. Whereas N,N-bis-[3,5-di(9H-carbazol-9-yl)phenyl]methylamine (CzPAMe) has the highest solid state triplet energy gap (E sub(T)) of 2.73 eV, tetrakis-[3,3',5,5'-(9H-carbazol-9-y l)]triphenylphosphine oxide (CzPPO) and N,N-bis-[3,5-di(9H-carbazol-9-yl)phenyl]pyrimidin-2-ami ne (CzPAPm) are two host materials which are potentially bipolar for charge transport due to the electron deficient units of phenylphosphine oxide and pyrimidine, respectively. Due to the insufficient E sub(T) (2.56 eV) of CzPAPm, CzPPO or CzPAMe devices are significantly better than CzPAPm devices with or without a 1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]phe nylene (OXD-7) co-host. Particularly, having no OXD-7 co-host and no vacuum thermal-deposited extra electron transporting layer, single-layer devices of CzPPO surpass CzPAMe devices and reach current efficiencies as high as 9.32 cd A super(-1) (or power efficiency of 4.97 lm W super(-1)), one of the highest efficiencies among small molecular devices with the same fabrication process and same device configuration.
出版日期： 2014-01-01
出處： Journal of materials chemistry. C, Materials for optical and electronic devices, 2014-01, Vol.2 (2), p.382-391
資源來源： Royal Society of Chemistry
識別號： ISSN: 2050-7526
識別號： EISSN: 2050-7534
識別號： DOI: 10.1039/C3TC31641F |
| 顯示於類別: | [化學學系] 期刊論文
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