Journal
MATERIALS ADVANCES
Volume 2, Issue 18, Pages 6068-6074Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ma00602a
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Funding
- Hundred Talents Program of Sun Yat-Sen University [76190-18841211]
- National Natural Science and Foundation of China (NSFC) [61905206]
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Three 2,1,3-naphthodiazole-based red emissive model compounds were synthesized in this study, with RMC2 showing a pure red peak emission at 625 nm and high fluorescence quantum efficiency. Red OLEDs based on RMC2 demonstrate high efficiency and cost-effective features.
Red organic light emitting diodes (OLEDs) based on purely organic emitters with high efficiency, good colour chromaticity coordinates and low efficiency roll-off features are in high demand for display and lighting applications. Additionally, to simplify the device fabrication processes, it is desirable to develop OLEDs with non-doped emission layers. In this work, three 2,1,3-naphthodiazole-based red emissive model compounds (RMCs) with tailored electron-donating structures were synthesized. In comparison with the orange emissive RMC1 and the near infrared emissive RMC3, RMC2 with a moderate electron donating ability demonstrates a pure red peak emission at 625 nm. Moreover, RMC2 shows high fluorescence quantum efficiency (phi(f)) in both diluted solution (0.76) and neat films (0.41). Non-doped saturated red OLEDs based on RMC2 with a maximum luminous efficiency of 5.3 cd A(-1), a maximum external quantum efficiency (EQE) of 6.3% and good CIE coordinates of (0.64, 0.35) are demonstrated. In addition, the device shows a slight efficiency roll-off feature, displaying an EQE of 5.1% at a brightness of 1000 cd m(-2).
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