Highly efficient multilayer organic pure blue light emitting diodes with substituted carbazoles compounds in the emitting layer

被引:22
作者
Fischer, A [1 ]
Chénais, S
Forget, S
Castex, MC
Adès, D
Siove, A
Denis, C
Maisse, P
Geffroy, B
机构
[1] Univ Paris 13, Inst Galilee, Phys Lasers Lab, F-93430 Villetaneuse, France
[2] Univ Paris 13, Inst Galilee, CNRS, BPS B20A, F-75010 Villetaneuse, France
[3] Univ Paris 07, Fac Med Lariboisiere St Louis, F-75010 Paris, France
[4] CEA Saclay, Lab Cellules & Composants, LITEN, DSEN, F-91191 Gif Sur Yvette, France
关键词
D O I
10.1088/0022-3727/39/5/004
中图分类号
O59 [应用物理学];
学科分类号
摘要
Bright blue organic light-emitting diodes (OLEDs) based on 1,4,5,8,N-pentamethylcarbazole (PMC) and on dimer of N-ethylcarbazole (N,N'-diethyl-3,3'-bicarbazyl) (DEC) as emitting layers or as dopants in a 4,4'-bis(2,2'-diphenylvinyl)-1,1'-biphenyl (DPVBi) matrix are described. Pure blue light with the CIE coordinates (x = 0.153, y = 0.100), electroluminescence efficiency eta(EL) of 0.4 cd A(-1), external quantum efficiency eta(ext) of 0.6% and luminance L of 236 cd m(-2) (at 60 mA cm(-2)) were obtained with PMC as an emitter and the 2,9-dimethyl-4,7-diphenyl-1,10-phenantroline (BCP) as a hole-blocking material in five-layer emitting devices. The highest efficiencies eta(EL) of 4.7 cd A(-1) and eta(ext) = 3.3% were obtained with a four-layer structure and a DPVBi DEC-doped active layer (CIE coordinates x = 0.158, y = 0.169, lambda(peak) = 456 nm). The eta(ext) value is one the highest reported at this wavelength for blue OLEDs and is related to an internal quantum efficiency up to 20%.
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页码:917 / 922
页数:6
相关论文
共 25 条
[1]   Degradation phenomena in small-molecule organic light-emitting devices [J].
Aziz, H ;
Popovic, ZD .
CHEMISTRY OF MATERIALS, 2004, 16 (23) :4522-4532
[2]   Blue organic light emitting diodes based on bicarbazyle derivates: Device stability and multilayer configuration [J].
Bacsa, WS ;
Schaer, M ;
Zuppiroli, L ;
Ades, D ;
Siove, A .
JOURNAL OF APPLIED PHYSICS, 1998, 84 (10) :5733-5738
[3]   Very high-efficiency green organic light-emitting devices based on electrophosphorescence [J].
Baldo, MA ;
Lamansky, S ;
Burrows, PE ;
Thompson, ME ;
Forrest, SR .
APPLIED PHYSICS LETTERS, 1999, 75 (01) :4-6
[4]   High-efficiency fluorescent organic light-emitting devices using a phosphorescent sensitizer [J].
Baldo, MA ;
Thompson, ME ;
Forrest, SR .
NATURE, 2000, 403 (6771) :750-753
[5]   Carbazole compounds as host materials for triplet emitters in organic light-emitting diodes:: Tuning the HOMO level without influencing the triplet energy in small molecules [J].
Brunner, K ;
van Dijken, A ;
Börner, H ;
Bastiaansen, JJAM ;
Kiggen, NMM ;
Langeveld, BMW .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (19) :6035-6042
[6]   Bright-blue electroluminescence from a silyl-substituted ter-(phenylene-vinylene) derivative [J].
Gao, ZQ ;
Lee, CS ;
Bello, I ;
Lee, ST ;
Chen, RM ;
Luh, TY ;
Shi, J ;
Tang, CW .
APPLIED PHYSICS LETTERS, 1999, 74 (06) :865-867
[7]   ANGULAR-DEPENDENCE OF THE EMISSION FROM A CONJUGATED POLYMER LIGHT-EMITTING DIODE - IMPLICATIONS FOR EFFICIENCY CALCULATIONS [J].
GREENHAM, NC ;
FRIEND, RH ;
BRADLEY, DDC .
ADVANCED MATERIALS, 1994, 6 (06) :491-494
[8]   Highly efficient blue electroluminescence from a distyrylarylene emitting layer with a new dopant [J].
Hosokawa, C ;
Higashi, H ;
Nakamura, H ;
Kusumoto, T .
APPLIED PHYSICS LETTERS, 1995, 67 (26) :3853-3855
[9]   EFFICIENT ELECTROLUMINESCENCE OF DISTYRYLARYLENE WITH HOLE TRANSPORTING ABILITY [J].
HOSOKAWA, C ;
TOKAILIN, H ;
HIGASHI, H ;
KUSUMOTO, T .
JOURNAL OF APPLIED PHYSICS, 1995, 78 (09) :5831-5833
[10]   Efficient blue organic light-emitting diodes based on an oligoquinoline [J].
Kulkarni, AP ;
Gifford, AP ;
Tonzola, CJ ;
Jenekhe, SA .
APPLIED PHYSICS LETTERS, 2005, 86 (06) :1-3