Voltage reduction (2.4 V at 2 mA/cm 2 ) and efficiency improvement (7-times) were demonstrated in blue QLEDs by positive aging process, which came from (1) improvement of carrier injection at ZnO/QD interface and/or carrier transport in QD layer, and (2) enhancement of PLQY of QD emissive layer.
KeywordsQLED; blue emission; high efficiency; positive aging. P-108 / W.-C. Ding SID 2018 DIGEST • 1623
Optical sensors with high oxygen sensitivity and efficient deep-blue OLEDs with CIEy of 0.08 was developed using the simplicity in molecular design of di-tert-butyl-dimethylacridanyl disubstituted oxygafluorene.
We have demonstrated that degradation of the hole-transporting layer material in the blue quantum-dot light-emitting diode (QLED) is the main reason accounts for the efficiency loss operated under constant current driving, and the operation lifetime can be elongated by 85% under pulse-mode driving compared to DC case.Keywords QLED, blue emission, lifetime. Figure 3. (a) PL spectra of QLED excited at 340 nm. PL spectra of QLED excited at 420 nm with different HTL thickness: (b) 0 nm, (c) 7 nm, (d) 14 nm, and (e) 28 nm.Figure 4. Enhancement factor for the QLED drive by pulsemode with 10 kHz and different duty cycle.
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