| 光谱学与光谱分析 |
|
|
|
|
|
| Effects of PBD on the Luminescence Properties of PVK∶Ir(ppy)3 |
| YANG Shao-peng1,YANG Ya-ru1,ZHAO Su-ling2,XU Zheng2,ZHANG Fu-jun2,ZHANG Xue-feng1,LU Su-kui1,QIN Xiang-dong1* |
1. Institute of Physical Science and Technology, Hebei University, Baoding 071002, China
2. Institute of Optoelectronics Technology, Beijing Jiaotong University, Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing 100044, China |
|
|
|
|
Abstract The effects of PBD on the luminescence properties of PVK∶Ir(ppy)3 codoped with PBD with lower concentration were investigated. Two kinds of devices with the structures of ITO/PVK∶Ir(ppy)3/PBD/Al and ITO/PVK∶Ir(ppy)3∶PBD/Al were fabricated. PVK emission appears in the electroluminescence (EL) spectra of ITO/PVK∶Ir(ppy)3/PBD/Al. The reason is that the Forster energy transfer is not efficient enough in the emission layer, and then the emission layer was doped with PBD. A set of devices were fabricated with the configuration of ITO/PVK∶Ir(ppy)3∶PBD/BCP/Al. The doping weight ratio of PVK∶Ir(ppy)3 was fixed as 100∶1, and the weight ratio of PBD changed from 100∶0 (PVK∶PBD) to 100∶20. The photoluminescence (PL) spectra and electroluminescence (EL) spectra of these devices were measured. Through the analysis of their luminescence, it was found that the brightness of these devices codoped with PBD is improved. The brightness of these devices increases with increasing PBD doping ratio as the ratio does not exceed 100:10(PVK∶PBD). The PBD codoping enhances the injection and transportation of electron, resulting in the enhanced carrier recombination probability. If the doping ratio of PBD exceeds 100∶10(PVK∶PBD), the brightness of the device decreases. There are two reasons. One is that the superfluous PBD causes the carriers to be imbalanced and induces a larger leakage current. The other is that the superfluous PBD may block the hoping of holes or electrons between the PVK chains. The brightness is the strongest when the weight ratio of PVK to PBD is 100∶10.
|
|
Received: 2007-06-10
Accepted: 2007-09-12
|
|
|
|
Corresponding Authors:
QIN Xiang-dong
E-mail: spyang@mail.hbu.edu.cn
|
|
[1] ZHANG Fu-jun, XU Zheng, HUANG Jin-zhao, et al(张福俊，徐 征，黄金昭, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2006，26(8)：1403.
[2] LIU Ling, XU Zheng, ZHANG Fu-jun, et al(刘 玲，徐 征，张福俊，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2006，26(7)：1199.
[3] Baldo M A, O’Brien D F, You Y, et al. Nature, 1998, 395: 151.
[4] Cao Yong, Ian D Parker, Yu Gang, et al. Nature, 1999, 397: 414.
[5] Wohlgenannt M, Tandon K, Mazumdar S, et al. Nature,2001, 409: 494.
[6] Baldo M A, Lamansky S, Burrows P E, et al. Appl. Phys. Lett., 1999，75：4.
[7] Adachi C, Baldo M A, Forrest S R, et al. Appl. Phys. Lett.,2000, 77: 904.
[8] Ikai M, Tokito S, Sakamoto Y, et al. Appl. Phys. Lett.,2001, 79: 156.
[9] Lamansky S, Djurovich P, Murphy D, et al. J. Am. Chem. Soc.,2001, 123: 4304.
[10] Wong Chi Tak, CHAN Waikin. Advan. Mater., 1999, 11: 455.
[11] Gong X, Ostrowski J C, Moses D, et al. Advanced Functional Materials,2003, 13(6): 439.
[12] LI Bin, MA Dong-ge, et al(李 斌, 马东阁, 等). Acta Physlco-Chimica Sinica(物理化学学报), 1998, 14(4): 306.
[13] Gong X, Ostrowski J C, Bazan G C, et al. Appl. Phys. Lett.,2003, 81: 3711.
[14] Chen F C, Chang S C, He G, et al. Polym. Sci. Part B，2003, 41: 2681.
[15] Negres R A, Gong X, Ostrowski J C, et al. Phys. Rev. B,2003, 68(11): 5209.
[16] YANG Sheng-yi，WANG Zhen-jia，XU Xu-rong，et al(杨盛谊，王振家，徐叙，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2000，20(6)：872.
[17] DAO Dong-liang，HUANG Bao-gui，XU Yi-zhuang，et al(陶栋梁，黄保贵，徐怡庄，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2001，21(6)：740.
[18] XU Deng-hui, DENG Zhen-bo, XU Ying, et al(徐登辉，邓振波，徐 颖, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2006，26(8)：1406. |
| [1] |
ZHENG Xu-gang1, 2, SONG Dan-dan1, 2, ZHAO Su-ling1, 2, QIAO Bo1, 2, SHEN Chong-yu3, XU Zheng1, 2*. Effect of Water Vapor Treatment on the Performance of Quantum Dot Light-Emitting Diodes[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 40(04): 1034-1039. |
| [2] |
WANG Guo, YANG Xin, LI Dong-ying, SUN Xin-yu, FANG Yi-xu, ZHANG Yong, SU Shi-chen*. High Color Gamut Quantum Dots LED and Its Application Research in Backlight Display[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 40(04): 1113-1119. |
| [3] |
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. |
| [4] |
ZHUO Ning-ze1, 2, 3, ZHANG Na1, 2, CHEN Yong-hao4, JIANG Peng4, CHENG Shao-wen5, ZHU Yue-hua1, 2, WANG Hai-bo2*. Preparation and Spectral Properties of White Light Emitting LED Based on Layered Remote Phosphor Film[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(08): 2337-2343. |
| [5] |
LI Bo-chao1, 2, ZHUO Ning-ze2*, LI Wen-quan2,3, HE Qing-yang1, 2, HUANG Ru-xi2, LIU Guang-xi2, YE En-gan1, 2, WANG Hai-bo2*. The Preparation and Properties Study of High CRI White LED Based on Remote Phosphor Technology [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(03): 728-732. |
| [6] |
LIU Sheng-qiang1, YU Jun-sheng1*, ZENG Yan-bo1, ZHAO Juan1, DU Chun-lei2 . Spectral Characteristics of White Organic Light-Emitting Devices Based on Phosphorescent System of Three Iridium Chelates [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(03): 636-641. |
| [7] |
YANG Shao-peng1,ZHANG Xue-feng1,ZHAO Su-ling2,XU Zheng2,ZHANG Fu-jun2,YANG Ya-ru1,LI Qing1, PANG Xue-xia１. Luminescence Characteristics of PVK Doped with Ir(ppy)3[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(03): 512-516. |
| [8] |
XIONG Sha,HUANG Shi-hua*,TANG Ai-wei,TENG Feng,LIANG Chun-jun,XU Zheng. Investigation on Electroluminescence of MEH-PPV/ZnSe Nanocomposite Device[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(02): 249-252. |
| [9] |
GAO Zhao-yang1, ZHANG Xu2，ZHENG Dai-shun1, HE Xi-yuan1, ZHANG Fu-jia1*. Surface and Interface Analysis for Copper Phthalocyanine (CuPc) and Indium-Tin-Oxide (ITO) Using X-Ray Photoelectron Spectroscopy (XPS)[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(04): 502-506. |
|
|
|
|
