| 光谱学与光谱分析 |
|
|
|
|
|
| Influence of MnO3 on Photoelectric Performance in Organic Light Emitting Diodes |
| GUAN Yun-xia1, CHEN Li-jia1, CHEN Ping2, FU Xiao-qiang1, NIU Lian-bin1,3* |
1. College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China
2. School of Physical Science and Technology, Southwest University, Chongqing 400715, China
3. Department of Materials Science and Engineering, University of Tennessee, Knoxville TN 37996, USA |
|
|
|
|
Abstract Organic Light Emitting Diodes (OLEDs) has been a promising new research point that has received much attention recently. Emission in a conventional OLED originates from the recombination of carriers (electrons and holes) that are injected from external electrodes. In the device, Electrons, on the other hand, are injected from the Al cathode to an electron-transporting layer and travel to the same emissive zone. Holes are injected from the transparent ITO anode to a hole-transporting layer and holes reach an emitting zone through the holetransporting layer. Electrons and holes recombine at the emissive film to form singlet excited states, followed by emissive light. It is because OLED is basically an optical device and its structure consists of organic or inorganic layers of sub-wavelength thickness with different refractive indices. When the electron and holes are injected through the electrodes, they combine in the emission zone emitting the photons. These photons will have the reflection and transmission at each interface and the interference will determine the intensity profile. The emissive light reflected at the interfaces or the metallic electrode returns to the emissive layer and affects the radiation current efficiency. Microcavity OLED can produce saturated colors and narrow the emission spetrum as a new kind of technique. In the paper, we fabricate microcavity OLED using glass substrate. Ag film acts as the anode reflector mirror; NPB serves as the hole-transporting material; Alq3 is electron-transporting material and organic emissive material; Ag film acts as cathode reflector mirror. The microcavity OLED structures named as A, B, C and D are glass/Ag(15 nm)/MoO3(x nm)/NPB(50 nm)/Alq3(60 nm)/Al(100 nm). Here，A, x=4 nm; B, x=7 nm; C, x=10 nm; D, x=13 nm. The characteristic voltage, brightness and current of these devices are investigated in the electric field. The luminance from the Devices A, B, C and D reaches the luminance of 928, 1 369, 2 550 and 2 035 cd·m-2, respectively at 13 V. At 60 mA·cm-2, the current efficiency of the microcavity OLEDs using MnO3 are about 2.2, 2.6, 3.1 and 2.6 cd·A-2 respectively. It is found that electrons are majority carriers and holes are minority carriers in this microcavity OLEDs. MnO3 film can improve hole injection ability from 4 to 10 nm. In addition, hole injection ability is increased with the increasing thickness of the MnO3 film.
|
|
Received: 2014-09-17
Accepted: 2015-01-18
|
|
|
|
Corresponding Authors:
NIU Lian-bin
E-mail: niulb03@126.com
|
|
[1] Helander M G. Science, 2011, 332: 944.
[2] Forrest S R. Nature, 2004, 428: 911.
[3] ZHANG Wei, ZHANG Fang-hui, HUANG Jin(张 微，张方辉，黄 晋). Spectroscopy and Spectral Analysis (光谱学与光谱分析), 2013, 33(6): 1763.
[4] Wang Q, Hany A. Appl. Phys. Lett., 2014, 105: 053304.
[5] Sayantan D, Alford T L. J. Appl. Phys., 2014, 116: 044905.
[6] HUANG Chun-hui, LI Fu-you, HUANG Wei. Introduction to Organic Light Emitting Materials and Devices(有机电致发光材料与器件导论). Shanghai: Fudan University Press (上海：复旦大学出版社)，2005. 2.
[7] Sun N, Zhao Y B, Zhao F C，et al. Appl. Phys. Lett., 2014, 105: 013303.
[8] HUANG Di, XU Zheng, ZHAO Su-ling(黄 迪, 徐 征, 赵谡玲). Acta Phys. Sin.(物理学报), 2014, 63: 027301.
[9] Wang Q, Ma D G, Leo K et al. Appl. Phys. Lett., 2014, 104: 193303.
[10] Chang Y L, Gong S, Wang X et al. Appl. Phys. Lett., 2014, 104: 173303.
[11] Suzuki M, Yokoyama H, Brorson S D et al. Appl. Phys. Lett., 1991, 58: 998.
[12] Ji W Y, Zhang L T, Tian T Y et al. Organic Electronics, 2010, 11: 179.
[13] Xiang C Y, Koo W, So F et al. Light: Science & Applications, 2013, 2: 74.
[14] Dodabalapur A, Rothberg L J, Jordan R H，et al. J. Appl. Phys., 1996, 80: 6954. |
| [1] |
CUI Can1,2, SONG Dan-dan1,2, ZHAO Su-ling1,2, QIAO Bo1,2, XU Zheng1,2*. Improving the Efficiency of Solution-Processed, Blue Fluorescent Organic Light-Emitting Diodes (OLEDs) by Employing TADF Exciplex Hosts[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 40(03): 700-705. |
| [2] |
LI Xue1, SHAO Qiu-ping1, CHEN Shu-fen2*, HUANG Wei2 . Highly Efficient, Color-Stable White Top-Emitting Organic Light-Emitting Diodes[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(09): 2360-2364. |
| [3] |
ZHANG Yan-fei, ZHAO Su-ling*, XU Zheng . Improved Color Purity of Green OLED Device Based on Au Thin Film [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(04): 903-905. |
| [4] |
HUANG Qing-yu1,2, ZHAO Su-ling1,2*, XU Zheng1,2, FAN Xing1,2, WANG Jian1,2, YANG Qian-qian1,2 . White Organic Light-Emitting Diodes Applied for Lighting Technology [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(01): 27-33. |
| [5] |
ZHANG Chun-yu1，2, WANG Cheng3, XIAO Li-guang1, LU Jing-bin2, WANG Hong-jie1, KONG Ling-wei1 . Spectral Analysis of Organic/Microcavity Organic Light-Emitting Devices with the Change in Thickness of Organic Layer [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(01): 69-73. |
| [6] |
YAN Guang, ZHAO Su-ling*, XU Zheng, ZHANG Fu-jun, KONG Chao, LIU Xiao-dong, GONG Wei, GAO Li-yan . Study on the Movement of the Carrier Recombination Region in Organic Light-Emitting Diodes (OLEDs) Based on DPVBi/Alq3 [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(07): 1729-1733. |
| [7] |
GAO Li-yan, ZHAO Su-ling*, XU Zheng, ZHANG Fu-jun, SUN Qin-jun, ZHANG Tian-hui, KONG Chao . Effects of Hole-Injection Layers on the Performance of Blue Organic Light-Emitting Diodes [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(04): 886-889. |
| [8] |
ZHANG Chun-yu1，2, LU Jing-bin2*，WANG Cheng3，WANG Hong-jie1 . Simulation of Microcavity Organic Light Emitting Device with Two Kinds of Resonant Cavity Lengths [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(01): 47-50. |
| [9] |
LIAN Jia-rong，LIAO Qiao-sheng，YANG Rui-bo，ZHENG Wei，ZENG Peng-ju . Performance Dependence of Organic Light-Emitting Devices on the Thickness of Alq3 Emitting Layer[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(10): 2616-2619. |
| [10] |
WANG Dong-lin, JIANG Nan, JIANG Li-qun, ZHANG Zhen-li, PU Xiao-yun*. The Precise Assignment of Whispering Gallery Modes for Lasing Spectra Emitting from Cylindrical Micro-Cavities[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(12): 2749-2753. |
| [11] |
XU Wei, LU Fu-han,CAO Jin,ZHU Wen-qing,JIANG Xue-yin*,ZHANG Zhi-lin,XU Shao-hong. Multiplayer White Organic Light-Emitting Diodes with Different Order and Thickness of Emission Layers [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(02): 265-268. |
| [12] |
LIU Cheng-lin1,2, ZHANG Xin-yi2, ZHONG Ju-hua3, ZHU Yi-hua3, HE Bo4, WEI Shi-qiang4 . Spectrum Characterization and Fine Structure of Copper Phthalocyanine-Doped TiO2 Microcavities[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(10): 1966-1969. |
| [13] |
LIU Xiang, BAI Yu, CAO Jin, WEI Fu-xiang, ZHANG Xiao-bo, ZHU Wen-qing, JIANG Xue-yin*, ZHANG Zhi-lin. Spectrum Study on Highly Saturated Blue Organic Top-Emitting Devices with Microcavity Structure[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(09): 1696-1699. |
| [14] |
WANG Ji-you1，HAO Wei1，ZHAO Li-juan2, LU Ying3 . Photoluminescence Spectra of Trivalent Neodymium Doped TiBa Glass Microspheres [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(04): 499-501. |
| [15] |
XU Xue-mei1, 2, PENG Jing-cui1, LI Hong-jian1, QU Shu1, ZHAO Chu-jun1 . Effect of Temperature and Applied Voltage on the Recombination Efficiency in Double Layer Organic Light Emitting Diodes [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(01): 12-14. |
|
|
|
|
