A possible mechanism to tune magneto-electroluminescence in organic light-emitting diodes through adjusting the triplet exciton density

被引：17

作者：

Chen, P. ^{[1
,2
]}

Song, Q. L. ^{[1
]}

Choy, W. C. H. ^{[2
]}

Ding, B. F. ^{[2
]}

Liu, Y. L. ^{[1
]}

Xiong, Z. H. ^{[1
]}

机构：

[1] Southwest Univ, Sch Phys Sci & Technol, MOE Key Lab Luminescence & Real Time Anal, Chongqing 400715, Peoples R China

[2] Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong, Hong Kong, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 14期

关键词：

electroluminescence; excitons; magnetoresistance;

D O I：

10.1063/1.3644147

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

At 15 K, the high field decay of magneto-electroluminescence (MEL) in tris (8-hydroxyquinoine) aluminum (Alq(3))-based organic light-emitting diodes is greatly suppressed by mixing hole transport material N,N'-bis(naphthalen-1-y)-N,N'-bis(phenyl) benzidine (NPB) into Alq(3) emission layer. The positive correlation between the MEL decay and the triplet exciton density indicates the reduced triplet exciton density is the major contributing factor. The change of triplet exciton density and then the MEL upon NPB mixing may result from the strengths change of charge-triplets interaction, in which the injected Charges flowing through the exciton formation zone without forming static space charges play the most important role. (C) 2011 American Institute of Physics. [doi:10.1063/13644147]

引用

页数：3

共 21 条

[1] Sign Inversion of Magnetoresistance in Space-Charge Limited Organic Devices [J].

Bloom, F. L. ;

Kemerink, M. ;

Wagemans, W. ;

Koopmans, B. .

PHYSICAL REVIEW LETTERS, 2009, 103 (06)

[2] Bipolaron mechanism for organic magnetoresistance [J].

Bobbert, P. A. ;

Nguyen, T. D. ;

van Oost, F. W. A. ;

Koopmans, B. ;

Wohlgenannt, M. .

PHYSICAL REVIEW LETTERS, 2007, 99 (21)

[3] Magnetoelectroluminescence in tris (8-hydroxyquinolato) aluminum-based organic light-emitting diodes doped with fluorescent dyes [J].

Chen, P. ;

Lei, Y. L. ;

Song, Q. L. ;

Zhang, Y. ;

Liu, R. ;

Zhang, Q. M. ;

Xiong, Z. H. .

APPLIED PHYSICS LETTERS, 2009, 95 (21)

[4] Large magnetic field effects in organic light emitting diodes based on tris(8-hydroxyquinoline aluminum) (Alq3)/IN,N′-Di(naphthalen-1-yl)-N,N′ diphenyl-benzidine (NPB) bilayers [J].

Davis, AH ;

Bussmann, K .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, 2004, 22 (04) :1885-1891

[5] Magnetoresistance and efficiency measurements of Alq3-based OLEDs [J].

Desai, Pratik ;

Shakya, P. ;

Kreouzis, T. ;

Gillin, W. P. ;

Morley, N. A. ;

Gibbs, M. R. J. .

PHYSICAL REVIEW B, 2007, 75 (09)

[6] Magnetic field effects on the electroluminescence of organic light emitting devices: A tool to indicate the carrier mobility [J].

Ding, B. F. ;

Yao, Y. ;

Sun, Z. Y. ;

Wu, C. Q. ;

Gao, X. D. ;

Wang, Z. J. ;

Ding, X. M. ;

Choy, W. C. H. ;

Hou, X. Y. .

APPLIED PHYSICS LETTERS, 2010, 97 (16)

[7] Capacitance-voltage characteristics of organic light-emitting diodes varying the cathode metal: Implications for interfacial states [J].

Garcia-Belmonte, Germa ;

Bolink, Henk J. ;

Bisquert, Juan .

PHYSICAL REVIEW B, 2007, 75 (08)

[8] Influence of an external magnetic field on the singlet and triplet emissions of tris-(8-hydroxyquinoline)aluminum(III) (Alq3) -: art. no. 104507 [J].

Gärditz, C ;

Mückl, AG ;

Cölle, M .

JOURNAL OF APPLIED PHYSICS, 2005, 98 (10)

[9] Tuning magnetoresistance between positive and negative values in organic semiconductors [J].

Hu, Bin ;

Wu, Yue .

NATURE MATERIALS, 2007, 6 (12) :985-991

[10] Magnetic-Field Effects in Organic Semiconducting Materials and Devices [J].

Hu, Bin ;

Yan, Liang ;

Shao, Ming .

ADVANCED MATERIALS, 2009, 21 (14-15) :1500-1516

← 1 2 3 →