TANG Xiao-qing, YU Jun-sheng, LI Lu, MA Tao, WEN Wen, JIANG Ya-dong. Effect of an Ultrathin BCP Layer on Organic Light-emitting Devices Performance[J]. Chinese Journal of Luminescence, 2008,29(2): 253-258
TANG Xiao-qing, YU Jun-sheng, LI Lu, MA Tao, WEN Wen, JIANG Ya-dong. Effect of an Ultrathin BCP Layer on Organic Light-emitting Devices Performance[J]. Chinese Journal of Luminescence, 2008,29(2): 253-258DOI:
Effect of an Ultrathin BCP Layer on Organic Light-emitting Devices Performance
Organic light-emitting diodes (OLEDs) have been intensively studied in the past several years due to their unique image quality and potential commercial application in flat-panel displays. Since Tang and Van Slyke reported the first double-layer green thin-film OLED with high brightness and low driving voltage
the OLEDs have demonstrated their good prospect around the world for this new display technology. The distingui-shed characteristics of OLEDs for displays include high efficiency
wide viewing angle
fast response time
low power on consumption and potentially low cost. In addition
their low processing temperatures
and thus versatility in substrates
render them suitable for some novel display applications
such as flexible displays. Over the past decade
the OLED display technology has made rapid progress; the major technical issues associated with these advanced OLED structures in general are how to design their optical structures and how to choose suitable materials with required electrical and optical properties. To achieve further advances in the brightness
power efficiency and the color purity of the electroluminescent spectrum of OLEDs
it will be necessary to develop new materials and design suitable device structures with long-term stability and lifetime. The mechanism for electroluminescent (EL) phenomenon involves in the injection of holes from anode and electrons from cathode under forward bias voltage
then the hole-electrons from excitons
and light emission appears through the radiative recombination of excitons. In order to obtain optimal luminance and power efficiency
organic electroluminescence requires the effective injection and recombination of the electrons and holes
and the injection balance of the electron and hole. Therefore
the reasonable device structures and the choice of the function materials of the OLEDs play the important role to improve the brightness
power efficiency and the device's stability.Based on conventional two-layer devices
the double heterostructure three-layer OLEDs with a structure of indium-tin oxide (ITO)/N
)/Mg:Ag have been fabricated using vacuum deposition method. Through characterizing the electroluminescence (EL) spectrum and the performance of the devices
the influence of different thickness from the BCP ultrathin film on the performance of OLEDs have been investigated. The results showed that when the thickness of BCP ultrathin film gradually ranges from 0.1 nm to 4.0 nm
the EL spectrum of the OLEDs shift from green to greenish-blue
and at last the device is absolutely blue-emitting from the hole transport layer of NPB. The ultrathin film of the BCP plays the role as not only effectively regulating the recombination region of charge carriers as well as EL spectrum
but also enhancing the brightness and luminance efficiency of OLEDs.
Tang C W,VanSlyke S A.Organic electroluminescent diodes[J].Appl.Phys.Lett.,1987,51(12):913-915.
Huang Y S,Jou J H,Kuo W,et al.High-efficiency white organic light-emitting devices with dual doped structure[J].Appl.Phys.Lett.,2002,80(15):2782-2784.
Sun Yuanyuan,Hua Yulin,Xu Feng,et al.Fabrication and study of flexible organic light emitting devices[J].J.Opto-electronics·Laser (光电子·激光),2005,16(9):1021-1024 (in Chinese).
Suzuki H,Hoshino S.Effects of doping dyes on the electroluminescent characteristics of multiplayer organic light-emitting diodes[J].Jpn.J.Appl.Phys.,1996,79(11):8816-8822.
Gao Z Q,Lee C S,Bello I,et al.White light electroluminescence from a hole-transporting layer of mixed organic mate-rials[J].Synth.Met.,2000,111-112:39-42.
Yu Junsheng,Li Weizhi,Jiang Yadong,et al.Bright yellow organic electroluminescent devices using a novel silole derivative as emitter[J].Jpn.J.Appl.Phys.,2007,46(2):L31-L33.
Yu Junsheng,Chen Zhijian,Sone M,et al.Red-light-emitting organic electroluminescent devices with bisanil dye as emi-tter[J].Jpn.J.Appl.Phys.(A),2001,40(5A):3201-3205.
Shi Yumeng,Deng Zhenbo,Xu Denghui,et al.The luminance efficiency improvement of organic light-emitting diodes using multiple-quantum-well structure[J].J.Optoelectronics·Laser (光电子·激光),2007,18(2):171-174 (in Chinese).
Niu Xia,Hua Yulin,Wu Kongwu,et al.Characteristics of a double layers white organic electroluminescent device using TBPe as dopant in a blue mixed layer[J].Chin.J.Lumin.(发光学报),2006,27(4):537-542 (in Chinese)
Wang Xiuru,Wu Youzhi,Chen Haoyu,et al.Dual color OLEDs using a novel Ir complex[J].Chin.J.Lumin.(发光学报),2006,27(5):695-699 (in Chinese).
Yan Lingling,Li Hongjian,Zhang Jianhuan,et al.Electroluminescence spectra in microcavity organic light-emitting devices[J].Chin.J.Lumin.(发光学报),2007,28(2):173-178 (in Chinese).
Xie Z Y,Hung L S,Lee S T.High-efficiency red electroluminescence from a narrow recombination zone confined by an organic double heterostructure[J].Appl.Phys.Lett.,2001,79(7):1048-1050.
Lee S S,Song T J,Cho S M.Organic white-light-emitting devices based on balanced exciton recombination zone split using a carrier blocking layer[J].Mater.Sci.& Eng.B,2002,95(1):24-28.
Li Qing,Yu Junsheng,Li Weizhi,et al.Fabrication and characterization of blue organic light emitting diodes based on N,N'-bis-(1-naphthyl)-N,N'-biphenyl-1,1'-biphenyl-44'-diamine[J].Chin.J.Lumin.(发光学报),2007,28(2):184-188 (in Chinese).
Kido J,Kimura M,Nagai K.Multilayer white light-emitting organic electroluminesecnt deviec[J].Science,1995,267(5202):1332-1334.
Lu D,Wu Y,Guo J,et al.Surface treatment of indium tin oxide by oxygen-plasma for organic light-emitting diodes[J].Mater.Sci.& Eng.B,2003,97(2):141-144.
Wang Jing,Jiang Wenlong,Wei Fengcai,et al.The thickness for BCP affects about OLED device[J].J.Optoelectronics·Laser (光电子·激光),2005,16(9):1036-1039 (in Chinese).
Yang C H,Guo T F,Sun L W.Highly efficient greenish blue-emitting organic diodes based on pyrene derivatives[J].J.Lumin.,2007,124(1):93-98.
Zhang Jimei,Jiang Xueyin,Zhang Zhilin,et al.Blue organic electroluminescent devices with enhanced efficiency on a novel structure basis[J].Chin.J.Lumin.(发光学报),2004,25(1):34-38 (in Chinese).
Yang Shengyi,Wang Zhenjia,Xu Zheng,et al.The influence of the electrinic-field distributing to the recombination region of carriers in two-layer organic light emitting diode[J].Chin.Science Bulletin (科学通报),2000,45(8):824-829 (in Chinese).
Effects of Illumination Intensity and Temperature on Double-layer Heterojunction Organic Photovoltaic Device Performance
Lithium Carbonate Doped 3,4,9,10-perylenetetracarboxylic Dianhydride for Enhanced Performance in Organic Light Emitting Diode
Fabrication and Characterization of Blue Organic Light-emitting Diodes Based on N,N-bis-(1-naphthyl)-N,N-biphenyl-1,1-biphenyl-4,4-diamine
Influence of PVK Hole Transport Layer on Performance of Organic Electroluminescent Devices
Related Author
ZHOU Bin
SUN Xiu-quan
GUO Jin-chuan
LI Wei-min
LIU Jin-suo
QUAN Wei
QIN Da-shan
CHEN Yu-huan
Related Institution
The College of Mechatronics and Control Engineering, Shenzhen University
The College of optoelectronics Engineering, Shenzhen University
The College of Electronic Science and Technology, Shenzhen University
School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC)