Sujith Sudheendran Swayamprabha1, Deepak Kumar Dubey1, Rohit Ashok Kumar Yadav1, Mangey Ram Nagar1, Aayushi Sharma2, Fu-Ching Tung3, Jwo-Huei Jou1. 1. Department of Materials Science and Engineering National Tsing Hua University Hsinchu 30013 Taiwan, Republic of China. 2. Birla Institute of Technology & Science-Pilani Shamirpet-Keesara Road, Jawahar Nagar, Shameerpet Hyderabad Telangana 500078 India. 3. Department of Solid State Lighting Technology Mechanical and Mechatronics Systems Research Labs. Industrial Technology and Research Institute Hsinchu 31057 Taiwan, Republic of China.
Abstract
Organic light emitting diodes (OLEDs) have been well known for their potential usage in the lighting and display industry. The device efficiency and lifetime have improved considerably in the last three decades. However, for commercial applications, operational lifetime still lies as one of the looming challenges. In this review paper, an in-depth description of the various factors which affect OLED lifetime, and the related solutions is attempted to be consolidated. Notably, all the known intrinsic and extrinsic degradation phenomena and failure mechanisms, which include the presence of dark spot, high heat during device operation, substrate fracture, downgrading luminance, moisture attack, oxidation, corrosion, electron induced migrations, photochemical degradation, electrochemical degradation, electric breakdown, thermomechanical failures, thermal breakdown/degradation, and presence of impurities within the materials and evaporator chamber are reviewed. Light is also shed on the materials and device structures which are developed in order to obtain along with developed materials and device structures to obtain stable devices. It is believed that the theme of this report, summarizing the knowledge of mechanisms allied with OLED degradation, would be contributory in developing better-quality OLED materials and, accordingly, longer lifespan devices.
Organic light emitting diodes (OLEDs) have been well known for their potential usage in the lighting and disn>an class="Chemical">play industry. The device efficiency and lifetime have improved considerably in the last three decades. However, for commercial applications, operational lifetime still lies as one of the looming challenges. In this review paper, an in-depth description of the various factors which affect OLED lifetime, and the related solutions is attempted to be consolidated. Notably, all the known intrinsic and extrinsic degradation phenomena and failure mechanisms, which include the presence of dark spot, high heat during device operation, substrate fracture, downgrading luminance, moisture attack, oxidation, corrosion, electron induced migrations, photochemical degradation, electrochemical degradation, electric breakdown, thermomechanical failures, thermal breakdown/degradation, and presence of impurities within the materials and evaporator chamber are reviewed. Light is also shed on the materials and device structures which are developed in order to obtain along with developed materials and device structures to obtain stable devices. It is believed that the theme of this report, summarizing the knowledge of mechanisms allied with OLED degradation, would be contributory in developing better-quality OLED materials and, accordingly, longer lifespan devices.
Authors: Christoph Hauenstein; Stefano Gottardi; Engin Torun; Reinder Coehoorn; Harm van Eersel Journal: Front Chem Date: 2022-01-27 Impact factor: 5.221