Blue Light Emitting Diodes based on Bright Quasi‐Type‐II ZnO@1‐Aminopyrene Hybrid Quantum Dots with a Long Operation Life. Issue 18 (25th June 2022)

• Record Type: Journal Article
• Authors: Kim, Hong Hee; Park, Soohyung; Ko, Keum‐Jin; Yim, Sang‐Youp; Kang, Jae‐Wook; Choi, Won Kook
• Is Part Of: Advanced optical materials. Volume 10:Issue 18(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-25
• Subjects: blue quantum‐dot LEDs -- excitation‐independent emission -- long operation lifetime -- photoluminescence quantum efficiency -- ZnO@1‐PyNH 2 hybrid quantum dots; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202200601
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: 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 hybridization of ZnO QDs with functionalized polyaromatic hydrocarbons (f‐PAHs) to synthesize a 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 of 3379 cd m −2 centered at λ = 441 nm with a full‐width‐at‐half maximum of 41.7 nm and CIE 1931 color coordinates of 0.17 and 0.09, a luminous efficacy of 3.32 cd A −1, power efficiency of 2.45 lm W −1, external quantum efficiency of 2.35%, and a remarkably long lifetime T 50 of >17 830 h at 100 cd m −2 . Abstract : Blue light emissive quantum‐dot light‐emitting diodes based on ZnO@1‐PyNH2 hybrid quantum dots are synthesized and demonstrate a long lifetime of T 50 = 17 830 h at the initial brightness of 100 cd m −2 .