AC-driven, color- and brightness-tunable organic light-emitting diodes constructed from an electron only device

• Main Authors: Zhao, Yongbiao, Chen, Rui, Gao, Yuan, Leck, Kheng Swee, Yang, Xuyong, Liu, Shuwei, Abiyasa, Agus Putu, Divayana, Yoga, Mutlugun, Evren, Tan, Swee Tiam, Sun, Handong, Demir, Hilmi Volkan, Sun, Xiao Wei
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2016
• Subjects: Organic light-emitting diode; Alternating current
• Online Access: https://hdl.handle.net/10356/81794; http://hdl.handle.net/10220/40972
• Institution: Nanyang Technological University

In this paper, a color- and brightness-tunable organic light-emitting diode (OLED) is reported. This OLED was realized by inserting a charge generation layer into an electron only device to form an n-i-p-i-n structure. It is shown that, by changing the polarity of applied voltage, only the p-i-n junction operated under positive bias can emit light and, by applying an AC voltage, emission from both junctions was realized. It is also shown that, by using a combination of blue- and red-emiting layers in two p-i-n junctions, both the color and brightness of the resulting white OLED can be tuned independently by changing the positive and negative amplitudes of the AC voltage.