Pyrenyl substituted 1,8-naphthalimide as a new material for weak efficiency-roll-off red OLEDs: a theoretical and experimental study

• Published in: New journal of chemistry Vol. 42; no. 15; pp. 12492 - 12502
• Main Authors: Bezvikonnyi, Oleksandr, Gudeika, Dalius, Volyniuk, Dmytro, Grazulevicius, Juozas, Bagdziunas, Gintautas
• Format: Journal Article
• Language: English
• Published: CAMBRIDGE Royal Soc Chemistry 2018; Royal Society of Chemistry
• Subjects: Carrier transport; Charge transport; Chemistry; Chemistry, Multidisciplinary; Current carriers; Diodes; Emitters; Emitters (electron); Organic light emitting diodes; Phosphorescence; Physical Sciences; Science & Technology; Thermal stability; TRIPHENYLAMINE; DIELECTRIC-CONSTANT; HOST MATERIALS; LIGHT-EMITTING DEVICES; QUANTUM EFFICIENCY; EMISSION; EXCIPLEX; ORGANIC SEMICONDUCTORS; TRANSPORT PROPERTIES; DERIVATIVES
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/c8nj01866a

Based on the theoretical calculations of excited states and semiconducting properties, a new 1,8-naphthalimide derivative having an electron-donating 1-pyrenyl group at the C-4 position was designed and synthesized. This derivative exhibited an excellent thermal stability and bipolar charge carrier transport ability. It was successfully utilized as a host in red phosphorescent organic light-emitting diodes showing an efficient energy transfer from the host to the phosphorescent emitter. The derivative may be a single material electroplex-forming host for PhOLEDs. The best fabricated red emitting device demonstrated maximum current, power, and external quantum efficiencies of 10.8 cd A(-1), 7 lm W-1, and 13.6%, respectively. The best device exhibited a high brightness of 15 300 cd m(-2) and weak efficiency-roll-off.