Carrier injection process of polymer light-emitting diodes

被引：8
|
作者：
Huang Wen-Bo
Peng Jun-Biao [1 ]
机构：
[1] S China Univ Technol, Inst Polymer Optoelect Mat & Devices, Guangzhou 510640, Peoples R China
[2] S China Univ Technol, Key Lab Specially Funct Mat & Adv Mfg Technol, Guangzhou 510640, Peoples R China
来源：
ACTA PHYSICA SINICA | 2007年 / 56卷 / 05期
关键词：
polymer light-emitting diodes (PLEDs); impedance spectroscopy; cole-cole figure; carrier injection;
D O I：
10.7498/aps.56.2974
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The carrier injection process of polymer light-emitting diodes (PLEDs) with MEH-PPV(poly[2-methoxy, 5-(2-ethylhexoxy)-1,4-phenylene vinylene]) as the light-emitting layer, was investigated using impedance spectroscopy, capacitance-voltage (C-V) and capacitance-frequency (C-F) techniques. The diodes have the configuration of ITO/PEDOT/MEH-PPV/Ba/Al. The experiments showed that there is an ohmic contact between electrodes and MEH-PPV, and holes and electrons injected from the cathodes are unbalanced. Charged traps in the MEH-PPV result in space-charge under positive bias, and the trap concentration was estimated at about 3.75 x 10(16) cm(-3).
引用
收藏
页码：2974 / 2978
页数：5
相关论文
共 17 条
  • [1] Dispersive electron transport in tris(8-hydroxyquinoline) aluminum (Alq3) probed by impedance spectroscopy -: art. no. 286601
    Berleb, S
    Brütting, W
    [J]. PHYSICAL REVIEW LETTERS, 2002, 89 (28)
  • [2] Capacitance measurements of junction formation and structure in polymer light-emitting electrochemical cells
    Campbell, IH
    Smith, DL
    Neef, CJ
    Ferraris, JP
    [J]. APPLIED PHYSICS LETTERS, 1998, 72 (20) : 2565 - 2567
  • [3] ELECTRICAL-IMPEDANCE MEASUREMENTS OF POLYMER LIGHT-EMITTING-DIODES
    CAMPBELL, IH
    SMITH, DL
    FERRARIS, JP
    [J]. APPLIED PHYSICS LETTERS, 1995, 66 (22) : 3030 - 3032
  • [4] Performance of polymer light-emitting diodes with saturated red-emitting poly (fluorine-co-4,7-dithien-2-yl-2, 1, 3-benzothiadiazole-carbazole or triphenylamine)
    Hou, LT
    Hou, Q
    Peng, JB
    Cao, Y
    [J]. ACTA PHYSICA SINICA, 2005, 54 (11) : 5377 - 5381
  • [5] LI HJ, 2002, ACTA PHYS SIN, V51
  • [6] ac impedance of polymer light-emitting electrochemical cells and light-emitting diodes: a comparative study
    Li, YF
    Gao, J
    Yu, G
    Cao, Y
    Heeger, AJ
    [J]. CHEMICAL PHYSICS LETTERS, 1998, 287 (1-2) : 83 - 88
  • [7] Frequency-dependent electrical response of holes in poly(p-phenylene vinylene)
    Martens, HCF
    Brom, HB
    Blom, PWM
    [J]. PHYSICAL REVIEW B, 1999, 60 (12): : R8489 - R8492
  • [8] Crossover from space-charge-limited to recombination-limited transport in polymer light-emitting diodes
    Martens, HCF
    Pasveer, WF
    Brom, HB
    Huiberts, JN
    Blom, PWM
    [J]. PHYSICAL REVIEW B, 2001, 63 (12):
  • [9] Peng YQ, 2002, CHINESE PHYS, V11, P1076, DOI 10.1088/1009-1963/11/10/320
  • [10] Impedance model of two-carrier space-charge limited current in organic light-emitting diodes.
    Pitarch, A
    Garcia-Belmonte, G
    Bisquert, J
    [J]. ORGANIC LIGHT-EMITTING MATERIALS AND DEVICES VIII, 2004, 5519 : 304 - 312
12