Yu Jiangbo, Zhou Liang, Zhang Hongjie, Zheng Youxuan, Li Huanrong, Deng Ruiping, Peng Zeping, Li Zhefeng
Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, and Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, People's Republic of China.
Inorg Chem. 2005 Mar 7;44(5):1611-8. doi: 10.1021/ic0485561.
The syntheses, structures, and electroluminescent properties are described for two new lanthanide complexes Ln(HFNH)3phen [HFNH = 4,4,5,5,6,6,6-heptafluoro-1-(2-naphthyl)hexane-1,3-dione; phen = 1,10-phenanthroline; Ln = Eu3+ (1), Sm3+ (2)]. Both complexes exhibit bright photoluminescence at room temperature (RT) due to the characteristic emission of Eu3+ and Sm3+ ion. Several devices using the two complexes as emitters were fabricated. The performances of these devices are among the best reported for devices using europium complex and samarium complex as emitters. The device based on 1 with the structure ITO/TPD (50 nm)/1:CBP (10%, 40 nm)/BCP (20 nm)/AlQ (30 nm)/LiF (1 nm)/Al (200 nm) exhibits the maximum brightness of 957 cd/m2, current efficiency of 4.14 cd/A, and power efficiency of 2.28 lm/W with a pure red Eu3+ ion emission. Especially, at the high brightness of 200 cd/m2, the device of 1 still has a high current efficiency of 2.15 cd/A. The device of 2 with a three-layer structure of ITO/TPD (50 nm)/2 (50 nm)/BCP (20 nm)/LiF (1 nm)/Al (200 nm) gives the maximum brightness of 42 cd/m2, current efficiency of 0.18 cd/A. By the comparison of the electroluminescent properties of devices based on Eu(TTA3phen (TTA = 2-thenoyltrifluoroacteonate) and 1, we conclude that the polyfluoration on the alkyl group of the ligand and the introduction of the long conjugate naphthyl group into the ligand improve the efficiency of 1-doped devices, especially at high current densities.
描述了两种新型镧系配合物Ln(HFNH)3phen的合成、结构和电致发光性质[HFNH = 4,4,5,5,6,6,6 - 七氟 - 1 - (2 - 萘基)己烷 - 1,3 - 二酮；phen = 1,10 - 菲咯啉；Ln = Eu3+(1)，Sm3+(2)]。由于Eu3+和Sm3+离子的特征发射，两种配合物在室温下均表现出明亮的光致发光。制备了几种以这两种配合物为发光体的器件。这些器件的性能是使用铕配合物和钐配合物作为发光体的器件中报道的最佳性能之一。基于结构为ITO/TPD(50 nm)/1:CBP(10%，40 nm)/BCP(20 nm)/AlQ(30 nm)/LiF(1 nm)/Al(200 nm)的1的器件，在纯红色Eu3+离子发射下，表现出最大亮度为957 cd/m2，电流效率为4.14 cd/A，功率效率为2.28 lm/W。特别是，在200 cd/m2的高亮度下，1的器件仍具有2.15 cd/A的高电流效率。具有ITO/TPD(50 nm)/2(50 nm)/BCP(20 nm)/LiF(1 nm)/Al(200 nm)三层结构的2的器件，最大亮度为42 cd/m2，电流效率为0.18 cd/A。通过比较基于Eu(TTA)3phen(TTA = 2 - 噻吩甲酰三氟丙酮)和1的器件的电致发光性质，我们得出结论，配体烷基上的多氟取代以及在配体中引入长共轭萘基提高了1掺杂器件的效率，特别是在高电流密度下。
