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Highly Stable and Scalable Blue QD-LED via an Evaporated TiO<inf>2</inf> Thin Film as an Electron Transport Layer

Bang, SY and Fan, XB and Jung, SM and Yang, J and Shin, DW and Suh, YH and Lee, TH and Lee, S and Choi, HW and Occhipinti, LG and Han, SD and Kim, JM (2020) Highly Stable and Scalable Blue QD-LED via an Evaporated TiO<inf>2</inf> Thin Film as an Electron Transport Layer. Advanced Optical Materials, 8.

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Abstract

Quantum dot-based light-emitting diodes (QD-LEDs) have excellent optical properties; however, their limitations of stability, reproducibility, and scalability due to the solution process are the major drawback. Herein, blue QD-LEDs fabricated with the conventional vacuum process using an e-beam-evaporated TiO2 thin film as an electron transport layer (ETL) are demonstrated. CdZnS/ZnS-based blue LEDs with a TiO2 thin film are fabricated under ambient conditions. They exhibit maximum external quantum efficiencies of 3.53% and a peak luminance of 2847 cd m−2. These values are retained, which minimizes performance degradation under high potential bias. In addition, the optimized evaporated TiO2 thin film has a negligible red shift (0.5 nm) of the peak wavelength between the photoluminescence spectrum and electroluminescence spectrum with stable full-width at half-maximum changing by less than 2 nm at high voltage. Finally, a blue QD-LED is fabricated on a scalable emission area of 2 × 2 in. with a patterned cathode accompanied by an evaporated TiO2 thin film, which allows to perform conventional photolithography. A highly stable and reproducible vaporized inorganic thin film as the ETL supports the multilayer architecture to minimize the process damage.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Cron Job
Date Deposited: 28 Aug 2020 21:21
Last Modified: 07 Sep 2021 02:10
DOI: 10.1002/adom.202001172