Highly Stable and Scalable Blue QD‐LED via an Evaporated TiO2 Thin Film as an Electron Transport Layer. Issue 21 (3rd September 2020)

• Record Type: Journal Article
• Authors: Bang, Sang Yun; Fan, Xiang‐Bing; Jung, Sung‐Min; Yang, Jiajie; Shin, Dong‐Wook; Suh, Yo‐Han; Lee, Tae Hoon; Lee, Sanghyo; Choi, Hyung Woo; Occhipinti, Luigi G.; Han, Soo Deok; Kim, Jong Min
• Is Part Of: Advanced optical materials. Volume 8:Issue 21(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-03
• Subjects: e‐beam evaporator -- light‐emitting diodes -- metal oxide thin films -- quantum dots -- scalable optoelectronics; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202001172
• Languages: English
• ISSNs: 2195-1071

Abstract

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. Abstract : A blue quantum dot‐based light‐emitting diode is fabricated on a scalable emission area of 2 × 2 in. with a patterned cathode accompanied by an evaporated TiO2 thin film as an electron transport layer, which allows to perform conventional photolithography. A highly reproducible vaporized inorganic TiO2 thin film secures a high performance and enhances the stability on the process.