Properties of Energy Transfer in Two Host Materials Doped with Ir(ppy)3 and Rubrene
LI Yan-rui1,ZHAO Su-ling1*,YANG Shao-peng2,XU Zheng1,ZHANG Fu-jun1,SONG Dan-dan1,XU Xu-rong1
1. Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education, Beijing 100044, China 2. Institute of Physical Science and Technology, Hebei University, Baoding 071002, China
Abstract：The devices with phosphorescent material tris(2-phenylpyridine)iridium [Ir(ppy)3] and fluorescent material 5,6,11,12-tetraphenylnaphthacene [Rubrene] as dopants in two kinds of host were constructed in the present study. Respectively, the two kinds of host are polyvinylcarbazole [PVK] and 4,4’-N,N-dicarbazole-biphenyl . We studied the properties of energy transfer between host materials and dopants. Firstly, the absorption and photoluminescence spectra of PVK, CBP, Ir(ppy)3 and Rubrene were measured. The spectral overlap between the photoluminescence of PVK and the absorption spectrum of Ir(ppy)3 is larger than that of Rubrene. The result of the spectral overlap for CBP is the same as PVK. It was shown that the energy transfer from the two host materials to Ir(ppy)3 is stronger than that to Rubrene. In addition, the energy transfer from Ir(ppy)3 to Rubrene is possible according to their absorption and photoluminescence spectra. We compared the electroluminescence properties of different devices. In device1 of ITO/PVK∶Rubrene∶Ir(ppy)3(100∶5∶x)/BCP(10 nm)/Alq3(20 nm)/Al and device 2 ITO/CBP∶Rubrene∶Ir(ppy)3(100∶5∶x)/BCP(10 nm)/Alq3(20 nm)/Al(x=0, 3), under the same DC bias, the electroluminescence results show that energy transfer from host to Rubrene through Ir(ppy)3 is the main mechanism. And energy transfer is much more efficient in CBP as host than in PVK. In addition, at the same voltage, the light power of the device doped with Ir(ppy)3 and Rubrene is obviously stronger than that of the device doped with Rubrene only. When the concentration of Ir(ppy)3 increases, the light power decreases at the same voltage, and the effect of concentration quenching is enhanced.
李艳蕊1,赵谡玲1*,杨少鹏2,徐征1,张福俊1,宋丹丹1,徐叙瑢1. 两种主体材料中Ir(ppy)3和Rubrene的能量传递特性[J]. 光谱学与光谱分析, 2009, 29(01): 1-5.
LI Yan-rui1,ZHAO Su-ling1*,YANG Shao-peng2,XU Zheng1,ZHANG Fu-jun1,SONG Dan-dan1,XU Xu-rong1. Properties of Energy Transfer in Two Host Materials Doped with Ir(ppy)3 and Rubrene. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(01): 1-5.
[1] Liao L S, Kluhek K P, Tang C W. Appl. Phys. Lett., 2004, 84(2): 167. [2] 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. [3] 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. [4] Forrest S R, Thomspon M E, Baldo M A. Nature, 2000, 403: 750. [5] Hamada Y, Kanno H, Tsujioka T, et al. Appl. Phys. Lett., 1999, 75: 1682. [6] D'Andrade B W, Baldo M A, Adachi C, et al. Appl. Phys. Lett., 2001, 79: 1045. [7] Gustufsson G, Cao Y, Treacy G M, et al. Nature, 1992, 357: 477. [8] Ohmori Y, Kajii H, Sawatani T, et al. Thin Solid Films., 2001, 393: 407. [9] YANG Sheng-yi，WANG Zhen-jia，XU Xu-rong，et al(杨盛谊，王振家，徐叙瑢，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2000，20(6)：872. [10] TAO 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. [11] 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. [12] WANG Jun, WEI Xiao-qiang, RAO Hai-bo(王 军, 魏孝强, 饶海波). Acta Phys. Sin.(物理学报), 2007, 56(2): 1156. [13] LU Jing, HOU Yan-bing, SHI Quan-min, et al(鲁 晶, 侯延冰, 师全民，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2007, 27(3): 420. [14] Jabber G E, Kippelen B, Armstrong N B. Appl. Phys. Lett., 1998, 73(9): 1185. [15] Mori T, Kim H G, Mizutani T, et al. Jpn. J. Appl. Phys., 2001, 40: 5346.
