Diazaspirocycles: novel platforms for efficient phosphorescent organic light-emitting diodes
| Autor: | Xiyu Fei, Jian Fan, Xiang-Yang Liu, Quan Ran, Man-Keung Fung, Yi-Jie Zhang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Phosphorescent oleds Band gap business.industry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Materials Chemistry OLED Optoelectronics Azafluorenone 0210 nano-technology Phosphorescence business High potential Diode |
| Zdroj: | Journal of Materials Chemistry C. 7:1370-1378 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/c8tc05462b |
| Popis: | Azafluorenone was discovered decades ago and its derivatives have received widespread attention in various research fields. However, the application of azafluorenone and its derivatives in organic light-emitting diode (OLED) materials is rarely reported and the related device performance is still not satisfactory. In this work, 1,4-diazafluorenone and its two analogues were prepared as precursors and three novel spiro compounds, SAIP, SAIQ, and SABIQ, were synthesized. The basic physical and chemical properties of SAIP, SAIQ, and SABIQ were studied in detail. From SAIP to SAIQ and SABIQ, the triplet energies (ETs) and optical band gaps (Egs) decrease gradually with the extension of the intramolecular conjugation length. In addition, blue/green/red and green/red phosphorescent OLEDs (PHOLEDs) were fabricated with SAIP and SAIQ as host materials, respectively. It is worth noting that all green and red devices based on SAIP or SAIQ showed a relatively high device performance with maximum external quantum efficiencies (EQEs) of 17.8% and 21.4%, respectively. These results further show the high potential of azafluorenone and its analogues in the building of efficient host materials. |
| Databáze: | OpenAIRE |
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