Indolocarbazole-Based Photo-Crosslinkable Hole-Transporting Layer for Efficient Solution-Processed Organic Light-Emitting Diodes
We designed and synthesized a new indolocarbazole-based polymer, poly(N,N-diphenyl(5,11-dihexylindolo[3,2,1-jk]carbazol-2-yl)amine) (PICA), for solution-processed organic light-emitting diodes (OLEDs). The highest occupied and lowest unoccupied molecular orbital energy levels of this polymer, −5.25...
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MDPI AG
2023-06-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/13/1934 |
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| author | Jeong Yong Park Seon Lee Kwak Hea Jung Park Do-Hoon Hwang |
| author_facet | Jeong Yong Park Seon Lee Kwak Hea Jung Park Do-Hoon Hwang |
| author_sort | Jeong Yong Park |
| collection | DOAJ |
| description | We designed and synthesized a new indolocarbazole-based polymer, poly(N,N-diphenyl(5,11-dihexylindolo[3,2,1-jk]carbazol-2-yl)amine) (PICA), for solution-processed organic light-emitting diodes (OLEDs). The highest occupied and lowest unoccupied molecular orbital energy levels of this polymer, −5.25 and −2.46 eV, respectively, are suitable for hole transport from the anode to the emissive layer. PICA was photo-crosslinked by UV irradiation with ethane-1,2-diyl bis(4-azido-2,3,5,6-tetrafluorobenzoate) (FPA) as the photoinitiator. Successful crosslinking was confirmed by a decreased intensity in the azide-stretching FT-IR peak and solvent test with toluene (a suitable solvent for PICA). The PICA film photo-crosslinked with 3 wt% FPA showed enhanced solvent resistance (90%) compared to the non-crosslinked neat PICA film (<20%). Moreover, OLED devices using PICA-based hole-transporting layers exhibited better device performance (EQE/LE/PE: 8.88%/12.97/8.12 in red devices, 10.84%/38.47 cd/A/25.06 lm/W in green devices) than those using poly-TPD:FPA. We demonstrated that the photo-crosslinked PICA can be applied as a hole-transporting layer in solution-processed OLEDs. |
| first_indexed | 2024-03-11T01:33:37Z |
| format | Article |
| id | doaj.art-c6e8088861cb45ac8211de676c292db8 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-11T01:33:37Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-c6e8088861cb45ac8211de676c292db82023-11-18T17:11:33ZengMDPI AGNanomaterials2079-49912023-06-011313193410.3390/nano13131934Indolocarbazole-Based Photo-Crosslinkable Hole-Transporting Layer for Efficient Solution-Processed Organic Light-Emitting DiodesJeong Yong Park0Seon Lee Kwak1Hea Jung Park2Do-Hoon Hwang3Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of KoreaDepartment of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of KoreaDepartment of Biology and Chemistry, Changwon National University, Changwon 51140, Republic of KoreaDepartment of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of KoreaWe designed and synthesized a new indolocarbazole-based polymer, poly(N,N-diphenyl(5,11-dihexylindolo[3,2,1-jk]carbazol-2-yl)amine) (PICA), for solution-processed organic light-emitting diodes (OLEDs). The highest occupied and lowest unoccupied molecular orbital energy levels of this polymer, −5.25 and −2.46 eV, respectively, are suitable for hole transport from the anode to the emissive layer. PICA was photo-crosslinked by UV irradiation with ethane-1,2-diyl bis(4-azido-2,3,5,6-tetrafluorobenzoate) (FPA) as the photoinitiator. Successful crosslinking was confirmed by a decreased intensity in the azide-stretching FT-IR peak and solvent test with toluene (a suitable solvent for PICA). The PICA film photo-crosslinked with 3 wt% FPA showed enhanced solvent resistance (90%) compared to the non-crosslinked neat PICA film (<20%). Moreover, OLED devices using PICA-based hole-transporting layers exhibited better device performance (EQE/LE/PE: 8.88%/12.97/8.12 in red devices, 10.84%/38.47 cd/A/25.06 lm/W in green devices) than those using poly-TPD:FPA. We demonstrated that the photo-crosslinked PICA can be applied as a hole-transporting layer in solution-processed OLEDs.https://www.mdpi.com/2079-4991/13/13/1934indolocarbazolephoto-crosslinkinghole-transporting materialorganic light-emitting diodes |
| spellingShingle | Jeong Yong Park Seon Lee Kwak Hea Jung Park Do-Hoon Hwang Indolocarbazole-Based Photo-Crosslinkable Hole-Transporting Layer for Efficient Solution-Processed Organic Light-Emitting Diodes Nanomaterials indolocarbazole photo-crosslinking hole-transporting material organic light-emitting diodes |
| title | Indolocarbazole-Based Photo-Crosslinkable Hole-Transporting Layer for Efficient Solution-Processed Organic Light-Emitting Diodes |
| title_full | Indolocarbazole-Based Photo-Crosslinkable Hole-Transporting Layer for Efficient Solution-Processed Organic Light-Emitting Diodes |
| title_fullStr | Indolocarbazole-Based Photo-Crosslinkable Hole-Transporting Layer for Efficient Solution-Processed Organic Light-Emitting Diodes |
| title_full_unstemmed | Indolocarbazole-Based Photo-Crosslinkable Hole-Transporting Layer for Efficient Solution-Processed Organic Light-Emitting Diodes |
| title_short | Indolocarbazole-Based Photo-Crosslinkable Hole-Transporting Layer for Efficient Solution-Processed Organic Light-Emitting Diodes |
| title_sort | indolocarbazole based photo crosslinkable hole transporting layer for efficient solution processed organic light emitting diodes |
| topic | indolocarbazole photo-crosslinking hole-transporting material organic light-emitting diodes |
| url | https://www.mdpi.com/2079-4991/13/13/1934 |
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