Transient and stable electroluminescence properties of alternating-current biased organic light-emitting diodes

Abstract

In this work, transient electroluminescence (EL) (brightness-voltage waveform curve) was utilized to investigate the working mechanism of alternating-current biased organic light-emitting diodes (AC-OLEDs). In lower frequency domain, injection potential barrier was the dominant effect to determine the luminescence intensity; with increased frequency, the influence of capacitance effect becomes dominant, which can be confirmed according to the investigations on stable EL of the AC-OLEDs. The results indicate that transient and stable EL can agree with each other perfectly. Besides, the stable EL reveals that the thinner device can take more effective capacitance effect.`

Keywords

organic light-emitting diodes (OLEDs) / alternating-current (AC) / transient electroluminescence (EL)

References

[1] Liu C P, Wang W B, Lin C W, Lin W C, Liu C Y, Kuo C H, Lee S H, Kao W L, Yen G J, You Y W, Chang H Y, Jou J H, Shyue J J. Molecular migration behaviors in organic light-emitting diodes with different host structures. Organic Electronics, 2011, 12(2): 376–382

[2] Chen F P, Xu B, Zhao Z J, Tian W J, Lü P. White organic light-emitting diodes based on electroplex from polyvinyl carbazole and carbazole oligomers blends. Chinese Physics B, 2010, 19(3): 037801

[3] Huang J Z, Xu Z, Zhao S L, Zhu H N, Song D D. Study on energy transfer in organic multilayer well structure. Synthetic Metals, 2007, 157(18-20): 739–742

[4] Huang J Z, Li S S, Feng X P, Wang P J, Zhang Z. Breakthrough of organic electroluminescence efficiency limited to 25% of that of photoluminescence in frequency domain. Asian Journal of Chemistry, 2010, 22(6): 4688–4692

[5] Huang J Z, Li S S, Feng X P, Wang P J, Zhang Z. Study on formation cross-section of singlet and triplet exciton in organic phosphorescent and fluorescent material. Asian Journal of Chemistry, 2010, 22(6): 4697–4702

[6] Liu D A, Teng F, Xu Z, Yang S Y, Quan S Y, He Q F, Wang Y S, Xu X R. Influence of capacitance effect on alternating-current organic light-emitting diodes. Solid State Communications, 2006, 137(7): 391–394

[7] Liu D A, Teng F, Xu Z, Yang S Y, Qian L, He Q F, Wang Y S, Xu X R. Enhanced brightness and efficiency in organic light-emitting diodes using an inorganic material SiO₂ as a buffer layer and electron-blocking layer. Journal of Luminescence, 2007, 122-123: 656–659

[8] Cusumano P, Buttitta F, Di Cristofalo A, Calí C. Effect of driving method on the degradation of organic light emitting diodes. Synthetic Metals, 2003, 139(3): 657–661

[9] Zou D C, Yahiro M, Tsutsui T. Spontaneous and reverse-bias induced recovery behavior in organic. Applied Physics Letters, 1998, 72(19): 2484–2486

[10] Liu X L, Wallmann I, Boudinov H, Kjelstrup-Hansen J, Schiek M, Lützen A, Rubahn H G. AC-biased organic light-emitting field-effect transistors from naphthyl end-capped. Organic Electronics, 2010, 11(6): 1096–1102

[11] Huang J Z, Li S S, Feng X P, Wang P J, Zhang Z. Confirmation on origin of primary electron in solid state cathodoluminescence. Chinese Physics B, 2010, 19(6): 067803

[12] Zhang F J, Zhao S L, Xu Z, Huang J Z, Xu X R. Transient demonstration of exciton behaviours in solid state cathodoluminescence under different driving voltage. Chinese Physics, 2007, 16(5): 1464–1466

[13] Huang J Z, Li S S, Feng X P, Wang P J, Zhang Z. Study on charge-transfer exciton using solid state cathodoluminescence based on MEH-PPV (Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]). Asian Journal of Chemistry, 2010, 22(6): 4693–4696

[14] Huang J Z, Xu Z, Zhao S L, Li Y, Zhang F J, Song L, Wang Y S, Xu X R. Organic/inorganic hetero-structures for enhanced electroluminescence. Solid State Communications, 2007, 142(7): 417–420

[15] Huang J Z, Xu Z, Zhao S L, Li S S, Feng X P, Wang P J, Zhang Z. Study on carrier mobility measurement using electroluminescence in frequency domain and electrochemical impedance spectroscopy. Measurement, 2010, 43(3): 295–298

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 61106059), the Encouragement Foundation for Excellent Middle-aged and Young Scientist of Shandong Province (No. BS2011NJ003), the Science-Technology Program of Higher Education Institutions of Shandong Province (No. J11LA10), the Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education, China (No. 2010LOI01), and Shandong Foundation for Development of Science and Technology (No. 2009GG20003028).

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg