Synthesis and Optoelectronic Characterization of a Monochromic Red-Emitting Europium(III) Complex Containing Triphenylamine-Functionalized Phenanthroline

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• 作者：Yu Liu ; Yafei Wang ; Haipeng Guo ; Meixiang Zhu ; Chun Li ; Junbiao Peng ; Weiguo Zhu ; Yong Cao
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：March 17, 2011
• 年：2011
• 卷：115
• 期：10
• 页码：4209-4216
• 全文大小：965K
• 年卷期：v.115,no.10(March 17, 2011)
• ISSN：1932-7455

文摘

A triphenylamine-functionalized ternary europium(III) complex of Eu(DBM)₃(DTPA-Phen), in which DTPA-Phen is 3,8-bis[4-(diphenylamino)phenyl]-1,10-phenanthroline and DBM is dibenzoylmethanato, was designed, synthesized and characterized. This complex emits the characteristic red emission of trivalent europium ion due to the ⁵D₀ 鈫?⁷F_j (j = 0鈭?) transitions under photoexcitation and exhibits high thermal stability (432 掳C). Using this complex as a guest and a blend of poly(9,9-dioctylfluorene) (PFO) along with 2-(tert-butylphenyl)-5-biphenylyl-1,3,4-oxadiazole (PBD) as a host matrix yielded the double-layer polymer light-emitting devices (PLEDs) with high performance. The narrow-bandwidth red emission that peaked at 612 nm with a full width at half-maximum of 10 nm was observed in these devices at the dopant concentrations from 1 to 8 wt %. The highest external quantum efficiency of 1.8% photons per electron at a current density of 1.2 mA/cm², with a maximum brightness of 1333 cd/m² at 173.2 mA/cm², was achieved from the device at 1 wt % dopant concentration. The results indicate that an introduction of triphenylamine groups into phenanthroline ligand can improve the performance of its Eu-organometallic compound-doped PLEDs.