Highly Efficient Bilayer-Structure Yellow-Green OLED with MADN Hole-Transport Layer and the Impedance Spectroscopy Analysis
Abstract Highly efficient bilayer-structure yellow-green organic light-emitting device (OLED) has been demonstrated based on MADN as hole-transport layer (HTL) and host-guest coped system of [Alq₃: 0.7 Wt% rubrene] as emitting and electron-trans- port layer. The device gives yellow-green emission through incomplete energy transfer from the host of Alq₃ to the guest of ru- brene. An electroluminescent peak of 560 nm, 1931 CIE color coordinates of (0.46, 0.52) and a maximum current efficiency of 7.63 cd · A⁻¹ (which has been enhanced by 30% in comparison with the counterpart having conventional NPB HTL) are ob- served. The hole-transporting characteristics of MADN and NPB have been systematically investigated by constructing hole-only devices and employing impedance spectroscopy analysis. Our results indicate that MADN can be served as an effective hole-trans- port material and its hole-transporting ability is slightly inferior to NPB. This overcomes the shortcoming of hole transporting more quickly than electron in OLED and improves carrier balance in the emitting layer. Consequently, the device current efficien- cy is promoted. In addition, the current efficiency of bilayer-structure OLED with MADN as HTL is comparable to that of conv- entinol trilayer-structure device with MADN as HTL and Alq₃ as electron-transport layer. This indicates that the simplified bi- layer-structure device can be achieved without sacrificing current efficiency. The emitting layer of [Alq: 0.7 Wt% rubrene possesses superior elecron-transporting ability.
| Medienart: |
Artikel |
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| Erscheinungsjahr: |
2015 |
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| Erschienen: |
2015 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:35 |
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| Enthalten in: |
Guang pu xue yu guang pu fen xi = Guang pu - 35(2015), 12 vom: 08. Dez., Seite 3296-9 |
| Sprache: |
Chinesisch |
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| Beteiligte Personen: |
Zhang, Xiao-wen [VerfasserIn] |
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| Themen: |
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| Anmerkungen: |
Date Completed 26.04.2016 Date Revised 11.03.2016 published: Print Citation Status PubMed-not-MEDLINE |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM258299908 |
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| 100 | 1 | |a Zhang, Xiao-wen |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Highly Efficient Bilayer-Structure Yellow-Green OLED with MADN Hole-Transport Layer and the Impedance Spectroscopy Analysis |
| 264 | 1 | |c 2015 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ohne Hilfsmittel zu benutzen |b n |2 rdamedia | ||
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| 500 | |a Date Completed 26.04.2016 | ||
| 500 | |a Date Revised 11.03.2016 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Abstract Highly efficient bilayer-structure yellow-green organic light-emitting device (OLED) has been demonstrated based on MADN as hole-transport layer (HTL) and host-guest coped system of [Alq₃: 0.7 Wt% rubrene] as emitting and electron-trans- port layer. The device gives yellow-green emission through incomplete energy transfer from the host of Alq₃ to the guest of ru- brene. An electroluminescent peak of 560 nm, 1931 CIE color coordinates of (0.46, 0.52) and a maximum current efficiency of 7.63 cd · A⁻¹ (which has been enhanced by 30% in comparison with the counterpart having conventional NPB HTL) are ob- served. The hole-transporting characteristics of MADN and NPB have been systematically investigated by constructing hole-only devices and employing impedance spectroscopy analysis. Our results indicate that MADN can be served as an effective hole-trans- port material and its hole-transporting ability is slightly inferior to NPB. This overcomes the shortcoming of hole transporting more quickly than electron in OLED and improves carrier balance in the emitting layer. Consequently, the device current efficien- cy is promoted. In addition, the current efficiency of bilayer-structure OLED with MADN as HTL is comparable to that of conv- entinol trilayer-structure device with MADN as HTL and Alq₃ as electron-transport layer. This indicates that the simplified bi- layer-structure device can be achieved without sacrificing current efficiency. The emitting layer of [Alq: 0.7 Wt% rubrene possesses superior elecron-transporting ability | ||
| 650 | 4 | |a English Abstract | |
| 650 | 4 | |a Journal Article | |
| 700 | 1 | |a Mo, Bing-jie |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Li-ming |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Hong-hang |e verfasserin |4 aut | |
| 700 | 1 | |a Chen, Er-wei |e verfasserin |4 aut | |
| 700 | 1 | |a Xu, Ji-wen |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Hua |e verfasserin |4 aut | |
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