title: Alternating current driven organic light emitting diodes using lithium fluoride insulating layers.
abstract: We demonstrate an alternating current (AC)-driven organic light emitting diodes (OLED) with lithium fluoride (LiF) insulating layers fabricated using simple thermal evaporation. Thermal evaporated LiF provides high stability and excellent capacitance for insulating layers in AC devices. The device requires a relatively low turn-on voltage of 7.1 V with maximum luminance of 87 cd/m(2) obtained at 10 kHz and 15 Vrms. Ultraviolet photoemission spectroscopy and inverse photoemission spectroscopy are employed simultaneously to examine the electronic band structure of the materials in AC-driven OLED and to elucidate the operating mechanism, optical properties and electrical characteristics. The time-resolved luminance is also used to verify the device performance when driven by AC voltage.
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Shang-Yi
authors.initials: SY
authors.lastname: Liu
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Jung-Hung
authors.initials: JH
authors.lastname: Chang
authors.affiliation: Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan.
authors.forename: I-Wen
authors.initials: IW
authors.lastname: Wu
authors.affiliation: 1] Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan [2] Department of Electrical and Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Chih-I
authors.initials: CI
authors.lastname: Wu