Carrier radiation distribution in organic light-emitting diodes

doi:10.1007/s12200-010-0128-3

Front Optoelec Chin

2010, Vol. 3

Issue (4) : 387-393 https://doi.org/10.1007/s12200-010-0128-3

RESEARCH ARTICLE

Carrier radiation distribution in organic light-emitting diodes

Lei DING(

), Fanghui ZHANG, Qian JIANG, Honggang YAN, Dinghan LIU

School of Electric and Information Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China

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Abstract

This paper is based on the analysis of white organic electroluminescent device electroluminescent spectrum to explain the regular pattern of carrier radiation distribution. It has proved electron that is injected from cathode is satisfied with the regularity of radiation distribution on the organic emitting layer. This radiation distribution is related to several factors, such as electron injection capabilities, applied electrical field intensity, carrier mobility, etc. The older instruction design is ITO/2-TNATA/NPB/ADN:DCJTB:TBPe/Alq₃/cathode. Get to change electron injector capabilities through using different cathode and also find electroluminescent spectrum to produce significant changes. Simultaneously, electron radiation quantity has some limitation, and electroluminescent spectrum reflects that spectral intensity does not change anymore when the ratio of cathode dopant reaches a value, namely, the quantity of electron’s radiation distribution gets to a saturated state on the organic emitting layer. It also shows the same spectrum variational phenomenon while changing the applied electrical field intensity. To put forward of the carrier radiation distribution is good for organic light emitting diode (OLED) luminescence properties analysis and research.

Keywords carrier radiation distribution organic light emitting diode (OLED) multiple dopants emission

Corresponding Author(s): DING Lei,Email:ostrich132@163.com

Issue Date: 05 December 2010

Cite this article:

Lei DING,Fanghui ZHANG,Qian JIANG, et al. Carrier radiation distribution in organic light-emitting diodes[J]. Front Optoelec Chin, 2010, 3(4): 387-393.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-010-0128-3
https://academic.hep.com.cn/foe/EN/Y2010/V3/I4/387

Fig.1 Configurations of devices and molecular structures of organic materials used

Fig.2 Current density versus voltage and luminance versus voltage for LiF and Ca:Al alloy cathode

Fig.3 Efficiency versus current density curves for LiF and Ca:Al alloy cathode

Fig.4 Energy-level diagram of devices (energy level values of ADN, TBPe, and DCJTB are quoted from Refs. [,])

Fig.5 Absolute EL spectra of Ca:Al alloy cathode at a driving current of (a) 0.02 A and (b) 0.04 A

Fig.6 EL spectra of Ca:Al alloy cathode at a driving current of (a) 0.02 A, (b) 0.04 A, and (c) 0.08 A, and (d) the EL spectra of LiF/Al cathode at a driving current of 0.03, 0.05, 0.07, and 0.09 A

1	Duggal A R, Shiang J J, Heller C M, Foust D F. Organic light-emitting devices for illumination quality white light. Applied Physics Letters , 2002, 80(19): 3470–3472 doi: 10.1063/1.1478786
2	Hagler T W, Pakbaz K, Voss K, Heeger A J. Enhanced order and electronic delocalization in conjugated polymers oriented by gel processing in polyethylene. Physical Review B: Condensed Matter and Materials Physics , 1991, 44(16): 8652–8666 doi: 10.1103/PhysRevB.44.8652
3	Bradley D D C, Friend R H. Light-induced luminescence quenching in precursor-route poly(p-phenylene vinylene). Journal of Physics: Condensed Matter , 1989, 1(23): 3671–3678 doi: 10.1088/0953-8984/1/23/011
4	Hung L S, Zhang R Q, He P, Mason G. Contact formation of LiF/Al cathodes in Alq-based organic light-emitting diodes. Journal of Physics D: Applied Physics , 2002, 35(2): 103–107 doi: 10.1088/0022-3727/35/2/302
5	Mori T, Fujikawa H, Tokito S, Taga Y. Electronic structure of 8-hydroxyquinoline aluminum/LiF/Al interface for organic electroluminescent device studied by ultraviolet photoelectron spectroscopy. Applied Physics Letters , 1998, 73(19): 2763–2765 doi: 10.1063/1.122583
6	Heil H, Steiger J, Karg S, Gastel M, Ortner H, Von Seggern H, St??el M. Mechanisms of injection enhancement in organic light-emitting diodes through an Al/LiF electrode. Journal of Applied Physics , 2001, 89(1): 420–424 doi: 10.1063/1.1331651
7	Mason M G, Tang C W, Hung L S, Raychaudhuri P, Madathil J, Giesen D J, Yan J, Le Q T, Gao Y, Lee S T, Liao L S, Cheng L F, Salaneck W R, dos Santos D A, Bredas J L. Interfacial chemistry of Alq₃ and LiF with reactive metals. Journal of Applied Physics , 2001, 89(5): 2756–2765 doi: 10.1063/1.1324681
8	Parker I D. Carrier tunneling and device characteristics in polymer light-emitting diodes. Journal of Applied Physics , 1994, 75(3): 1656–1666 doi: 10.1063/1.356350
9	Hinneburg D, Popp P, Leonhardt J. Radiation-induced charge-carrier distribution in electrical fields. Radiation Physics and Chemistry , 1985, 26(5): 575–577 doi: 10.1016/0146-5724(85)90213-4
10	Chang M Y, Wang C H, Lin S C, Chen Y F. High-brightness, high-color-purity, white organic light-emitting diodes featuring multiple emission layers. Journal of Applied Physics , 2009, 105(6): 064318 doi: 10.1063/1.3097285
11	Turak A, Grozea D, Feng X D, Lu Z H, Aziz H, Hor A M. Metal/AlQ₃ interface structures. Applied Physics Letters , 2002, 81(4): 766–768 doi: 10.1063/1.1494470
12	Bu H, Rabalais J W. Structure analysis of O₂ and H₂O chemisorption on a Si{100} surface. Surface Science , 1994, 301(1-3): 285–294 doi: 10.1016/0039-6028(94)91308-0
13	Aziz H, Popovic Z, Xie S, Hor A, Hu N, Tripp C, Xu G. Humidity-induced crystallization of tris (8-hydroxyquinoline) aluminum layers in organic light-emitting devices. Applied Physics Letters , 1998, 72(7): 756–758 doi: 10.1063/1.120867
14	Luo Y, Aziz H, Popovic Z D, Xu G. Electric-field-induced fluorescence quenching in dye-doped tris(8-hydroxyquinoline) aluminum layers. Applied Physics Letters , 2006, 89(10): 103505 doi: 10.1063/1.2337269
15	Jiang X Y, Zhang Z L, Zhu W Q, Xu S H. Highly efficient and stable white organic light emitting diode with triply doped structure. Displays , 2006, 27(4-5): 161–165 doi: 10.1016/j.displa.2006.05.002
16	Hamada Y, Kanno H, Tsujioka T, Takahashi H, Usuki T. Red organic light-emitting diodes using an emitting assist dopant. Applied Physics Letters , 1999, 75(12): 1682–1684 doi: 10.1063/1.124790
17	Feng J, Li F, Gao W B, Cheng G, Xie W F, Liu S Y. Improvement of efficiency and color purity utilizing two-step energy transfer for red organic light-emitting devices. Applied Physics Letters , 2002, 81(16): 2935–2937 doi: 10.1063/1.1515884
18	Lee T W, Park O O, Cho H N, Kim Y C. Cascade energy transfer in dye-doped ternary polymer blend light-emitting diodes. Synthetic Metals , 2002, 131(1-3): 129–133 doi: 10.1016/S0379-6779(02)00175-3
19	Tallman D E, Vang C, Wallace G G, Bierwagen G P. Direct electrodeposition of polypyrrole on aluminum and aluminum alloy by electron transfer mediation. Journal of Electrochemical Society , 2002, 149(3): C173–C179 doi: 10.1149/1.1448820
20	Zhang Z L, Jiang X Y, Zhao W M, Zhu W Q, Zhang B X, Xu S H.A white organic light emitting diode with improved stability. Journal of Physics D: Applied Physics , 2001, 34(20): 3083–3087 doi: 10.1088/0022-3727/34/20/313
21	Shi J M, Tang C W. Anthracene derivatives for stable blue-emitting organic electroluminescence devices. Applied Physics Letters , 2002, 80(17): 3201–3203 doi: 10.1063/1.1475361
22	Chen B J, Lee C S, Lee S T, Webb P, Chan Y C, Gambling W, Tian H, Zhu W H. Improved time-of-flight technique for measuring carrier mobility in thin films of organic electroluminescent materials. Japanese Journal of Applied Physics , 2000, 39(3A): 1190–1192 doi: 10.1143/JJAP.39.1190
23	Seo J H, Seo J H, Park J H, Kim Y K, Kim J H, Hyung G W, Lee K H, Yoon S S. Highly efficient white organic light-emitting diodes using two emitting materials for three primary colors (red, green, and blue). Applied Physics Letters , 2007, 90(20): 203507 doi: 10.1063/1.2740191

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