Journal
DYES AND PIGMENTS
Volume 136, Issue -, Pages 347-353Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2016.08.066
Keywords
Phenanthroimidazole; Intramolecular charge transfer; OLEDs; NUV emission; External quantum efficiency
Funding
- National Natural Science Foundation of China [51273108, 56173113, 51473138]
- National Basic Research Program of China (973 Program) [2013CB834803]
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A novel near ultraviolet (NUV) emitter, PIBCz, was designed and synthesized by attaching C3-position of the weak electron-donating N-phenylcarbazole group to C6-and C9-positions of phenanthroimidazole (PI) unit for limiting the molecular conjugation and intramolecular charge transfer (ICT) process. The new emitter exhibits strong NUV emission both in solution and thin film as well as good thermal and morphological stability. The PIBCz-based non-doped device shows a perfect color purity of CIE (0.15, 0.05), a very low turn-on voltage of 2.7 V and a maximum external quantum efficiency (EQE), current efficiency (CE) and power efficiency (PE) of 2.74%, 1.28 cd A(-1) and 1.12 lm W-1, respectively, which is comparable to state-of-the-art non-doped OLEDs in similar color gamut. This work demonstrates that effective management of ICT process is a valuable strategy to develop high efficiency NUV emitters. (C) 2016 Elsevier Ltd. All rights reserved.
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