標題: Highly efficient orange-emitting OLEDs based on phosphorescent platinum(II) complexes
作者: Laskar, IR
Hsu, SF
Chen, TM
應用化學系
Department of Applied Chemistry
關鍵字: 2-phenylbenzothiazole;platinum(II)-complex;photoluminescence;eximer;electroluminescence;dopant
公開日期: 2-Jun-2005
摘要: The syntheses, characterisations, photophysical properties and their applications in organic light emitting devices of a series of 2-phenylbenzothiazolato (bt)/substituted 2-phenylbenzothiazolato (X-bt) platinum(II) based square-planar complexes [(X-bt)Pt(acac); acac = acetylacetonate; X = unsubstituted (1), F (2), OMe (3) and CF3 (4)] are discussed. Reaction of K2PtCl4 with btH/X-btH in glacial acetic acid for a few days results in the dinuclear chloro-bridged Pt(II) complex, (bt/X-bt)Pt(mu-Cl)Pt(bt/X-bt) which is cleaved with acetylacetone to give the corresponding mononuclear (bt/X-bt)Pt(acac) complex. The (MeO-bt)Pt(acac) complex has been characterized by X-ray single crystal structure analysis. The packing diagram shows the Pt-Pt distances and the intermolecular spacings are 3.369 and 3.360 angstrom, respectively, which is consistent with excimer formation. It has also been supported by time-resolved photoluminescence (PL) measurements. The nature of the lowest emitting states are the triplet MLCT as well as triplet pi-pi* states and it has been tuned according to the electronic properties of the substituents. The electroluminescent (EL) devices were fabricated by doping platinum complexes 1 and 2 (the corresponding devices denoted as D-1 and D-2, respectively) into the host CBP (4,4'(N,N'-dicarbazole)biphenyl), in the emitting zone with a doping content of 5%, 7% and 9%. The EL performances for these devices are exceptionally high (14.3 and 16.0 cd A(-1) @2 mA cm(-2) and luminances 10 550 and 11320 cd m(-2) @100mA cm(-2) for D-1 and D-2, respectively). (C) 2005 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.poly.2005.02.009
http://hdl.handle.net/11536/13585
ISSN: 0277-5387
DOI: 10.1016/j.poly.2005.02.009
期刊: POLYHEDRON
Volume: 24
Issue: 8
起始頁: 881
結束頁: 888
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