Blue emitting iridium complexes: synthesis, photophysics and phosphorescent devices

被引:196
作者
Ragni, R
Plummer, EA
Brunner, K
Hofstraat, JW
Babudri, F
Farinola, GM
Naso, F
De Cola, L
机构
[1] Univ Bari, Dipartmento Chim, I-70126 Bari, Italy
[2] Univ Amsterdam, HIMS, NL-1018 WV Amsterdam, Netherlands
[3] Univ Munster, Inst Phys, D-48149 Munster, Germany
[4] Philips Res Labs, Nat Lab, NL-5656 AA Eindhoven, Netherlands
[5] Univ Bari, CNR, Dipartimento Chim, ICCOM,Sez Bari, I-70126 Bari, Italy
关键词
D O I
10.1039/b512081k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Homoleptic Ir(F(n)ppy)(3) and heteroleptic (F(n)ppy)(2)Ir(acac) complexes (n = 3: F(3)ppy = 2-(3',4',6'-trifluorophenyl) pyridine; n = 4: F(4)ppy = 2-(3',4',5',6'-tetrafluorophenyl) pyridine; acac = acetylacetonate) have been synthesized and their spectroscopic properties investigated. The homoleptic complexes exist as two stereoisomers, facial (fac) and meridional (mer), that have been isolated and fully characterized. Their electrochemical and photophysical properties have been studied both in solution and in the solid state and electroluminescent devices have been fabricated. The emissive layers in devices have been obtained mixing the iridium complexes with a PVK [poly(9-vinylcarbazole)] host matrix, in the presence of the electron carrier Bu- PBD [2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole]. The application of a voltage (5.0-6.5 V) between the electrodes of devices leads to electro-generated blue luminescence which has similar energy to the solution emissions. Interestingly, the stability of the devices made with the homoleptic fluorinated iridium complexes strongly depends on the stereochemistry of these phosphors and high (up to 5.5%) external quantum efficiencies for the fac complexes are measured.
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收藏
页码:1161 / 1170
页数:10
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