Thermal buffer materials for enhancement of device performance of organic light emitting diodes fabricated by laser imaging process
| Autor: | Ji-Hoon Lee, Seung Ji Cha, Joon Ho Jeon, Young Min Jeon, Min Chul Suh |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
business.industry General Chemistry Thermal transfer Condensed Matter Physics Laser Buffer (optical fiber) Electronic Optical and Magnetic Materials law.invention Biomaterials Stack (abstract data type) law Thermal Materials Chemistry OLED Optoelectronics Degradation (geology) Electrical and Electronic Engineering business Layer (electronics) |
| Zdroj: | Organic Electronics. 15:2802-2809 |
| ISSN: | 1566-1199 |
| DOI: | 10.1016/j.orgel.2014.08.009 |
| Popis: | Laser Induced Thermal Imaging (LITI) is a laser addressed thermal patterning technology with unique advantages such as an excellent uniformity of transfer film thickness, a capability of multilayer stack transfer and a possibility to fabricate high resolution as well as large-area display. Nevertheless, it has been an obstacle to use such a laser imaging process as a commercial technology so far because of serious deterioration of the device performances plausibly due to a re-orientation of the molecular stacking especially in the emitting layer during thermal transfer process. To improve device performances, we devised a new concept to suppress the thermal degradation during such kind of thermal imaging process by using a high molecular weight small molecular species with large steric hindrance as well as high thermostability as a thermal buffer layer to realize highly efficient LITI devices. As a result, we obtained very high relative efficiency (by EQE) up to 91.5% at 1000 cd/m 2 from the LITI devices when we utilize 10-(naphthalene-2-yl)-3-(phenanthren-9-yl)spiro[benzo[ij]tetraphene-7,9′-fluorene] as a thermal buffer material. |
| Databáze: | OpenAIRE |
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