Yoon, Suk-Young Kim, Jong-Hoon Kim, Kyung-Hye Han, Chang-Yeol Jo, Jung-Ho Jo, Dae-Yeon Hong, Seung ki Hwang, Jun Yeon Do, Young Rag Yang, Heesun 2024-01-19T19:30:50Z 2024-01-19T19:30:50Z 2021-09-05 2019-09 2211-2855 https://pubs.kist.re.kr/handle/201004/119638 Research direction of colloidal quantum dot (QD)-based LEDs (QLEDs), whose performance has substantially progressed over last two decades, has been oriented mostly to the fabrication of next-generation, high-color gamut display devices particularly based on Cd-containing QDs, while their extension to solid-state planar lighting application remains nearly unexplored. In this work, we report on all-solution-processed fabrication of group I-III-VI chalcogenide, non-Cd QDs-based high-efficiency white lighting electroluminescent (EL) devices. For this, using Zn-Cu-Ga-S (ZCGS) QD emitters having a high photoluminescence quantum yield (PL QY) of 80% a multilayered blue QLED consisting of poly(9-vinylcarbazole) hole transport layer (HTL) and Mg-alloyed ZnO nanoparticle electron transport layer (ETL) is first fabricated, showing a maximum external quantum efficiency (EQE) of 7.1%. Then, white QLEDs containing a mixture of blue ZCGS and yellow Cu-In-S QDs as a single emitting layer (EML) are constructed with the same HTL/ETL combination as above. White EL spectral distribution is facilely tunable simply by varying ZCGS-to-CIS QD content ratio in the EML of white EL device. The optimum white QLED not only generates the peak quantities of 2172 cd/m(2) in luminance and 4.6% in EQE, corresponding to the record values ever reported in non-Cd white EL devices, but exhibits high color rendering index up to 82. English Elsevier BV High-efficiency blue and white electroluminescent devices based on non-Cd I-III-VI quantum dots Article 10.1016/j.nanoen.2019.103869 1 Nano Energy, v.63 Nano Energy 63 N scie scopus 000480422400044 2-s2.0-85068255592 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article LIGHT-EMITTING-DIODES FULL-COLOR PERFORMANCE Non-Cd quantum dots White electroluminescence Bicolored High-efficiency