Browsing by Author "Chiu, Tien-Lung"

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Optimizing hole-injection in organic electroluminescent devices by modifying CuPc/NPB interface
(2011-09-01)
Jiang, Meng-Dan
;
Lee, Pei-Yu
;
Chiu, Tien-Lung
;
Lin, Hong-Cheu
;
Lee, Jiun-Haw
This investigation discusses the performance of an organic light-emitting device (OLED) with ultraviolet (UV) illuminated and remote pulsed Ar plasma (RPAP), treated copper phthalcyanine (CuPc) thin film on an indium tin oxide anode as the hole-blocking layer. UV treatment increased the driving voltage, the current efficiency decreased at the same time due to the poor sticking probability of NPB on the CuPc surface. By contrast, the driving voltage reduction and current efficiency enhancement were achieved at the same time for the OLED with the RPAP treated CuPc. Besides this, in such device, the thickness of CuPc affects seldom the current density-voltage-luminance characteristics. The surface characteristics of these processed CuPc thin films were investigated by using atomic force microscope, contact angle and X-ray photoelectron spectroscopy measurements, which showed the CuPc/, N,N'-bis-(1-naphthyl)-N,N'-dipheny1-1,1'-bipheny1-4,4'-diamine (NPB) interface was crucial to not only the interface energy barrier, but also the following NPB growth, mode. (C) 2011 Elsevier B.V. All rights reserved.
Smart Transflective Display Integrated with PDLC and OPV-embedded-OLED
(2009-01-01)
Lee, Jiun-Haw
;
Chiu, Tien-Lung
;
Chuang, Kai-Hsiang
;
Lin, Yi-Hsin
;
Wu, Shin-Tson
We demonstrated a hybrid transfective device by vertically integrating a PDLC and an OLED with OPV as the reflective and transmissive mode, respectively. Such an OPV in an OLED absorbs light and converts into electrical power, which reduces the power consumption and also acts as the integrated sensor.
Voltage Reduction and Lifetime Elongation of Organic Light-Emitting Diodes Using Photopolymerization for Fluorizated Polyxylylene Hole Injection Layer
(2012-03-01)
Jiang, Meng-Dan
;
Chiu, Tien-Lung
;
Lee, Pei-Yu
;
Yang, Shun-Po
;
Lin, Hong-Cheu
This study describes a novel method for manufacturing a hole injection layer of an organic light-emitting diode (OLED), comprising an ultraviolet (UV) reactive Br-fluorocarbon precursor (Br-CF2-C6F4-CF2-Br). The proposed method can be used to form a fluorizated polyxylylene film, demonstrating high repeatability on the anode as the hole injection layer of organic electroluminescent devices to enhance the hole injection, reduce the operating voltage of 1.2 V, and extend the operational lifetime by more than 150 times under a high current density of 125 mA/cm(2). Using a spin-coating process, the remaining precursor can be recycled to prevent wasting materials. UV curing without the solvent-removing process shortens manufacturing time. Hence, fabricating a high performance OLED using a simple, low-cost process is the aim of this study. (C) 2012 The Japan Society of Applied Physics