Blue Light Emitting Diodes based on Bright Quasi-Type-Ⅱ ZnO@1-Aminopyrene Hybrid Quantum Dots with a Long Operation Life

摘要

Non-toxic heavy metal, low-cost indium-free blue emissive quantum dots (QDs)are critical for the realization of self-emissive electroluminescent quantum dot(ELQD) light-emitting diode (LED) displays. A facile and effective hybridizationof ZnO QDs with functionalized polyaromatic hydrocarbons (f-PAHs) to synthesizea very bright and stable blue-light emissive quantum-dot LED (QLED)using non-toxic quasi-type-II ZnO@1-Aminopyrene hybrid QDs is reported.The optimized QLEDs of ITO/PEDOT:PSS/TFB/ZnO@1-Aminopyrene/TPBi/LiF/Al demonstrate very bright deep blue-light electroluminescence of3379 cd m~(?2) centered at λ = 441 nm with a full-width-at-half maximum of41.7 nm and CIE 1931 color coordinates of 0.17 and 0.09, a luminous efficacyof 3.32 cd A~(?1), power efficiency of 2.45 lm W?1, external quantum efficiency of2.35%, and a remarkably long lifetime T50 of >17 830 h at 100 cd m~(?2).