Effects of MEH-PPV Molecular Ordering in the Emitting Layer on the Luminescence Efficiency of Organic Light-Emitting Diodes
We investigated the effects of molecular ordering on the electro-optical characteristics of organic light-emitting diodes (OLEDs) with an emission layer (EML) of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). The EML was fabricated by a solution process which can make molecules...
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MDPI AG
2021-04-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/9/2512 |
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| author | Seok Je Lee Jun Li Seung Il Lee Chang-Bum Moon Woo Young Kim Jin Cao Chul Gyu Jhun |
| author_facet | Seok Je Lee Jun Li Seung Il Lee Chang-Bum Moon Woo Young Kim Jin Cao Chul Gyu Jhun |
| author_sort | Seok Je Lee |
| collection | DOAJ |
| description | We investigated the effects of molecular ordering on the electro-optical characteristics of organic light-emitting diodes (OLEDs) with an emission layer (EML) of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). The EML was fabricated by a solution process which can make molecules ordered. The performance of the OLED devices with the molecular ordering method was compared to that obtained through fabrication by a conventional spin coating method. The turn-on voltage and the luminance of the conventional OLEDs were 5 V and 34.75 cd/m<sup>2</sup>, whereas those of the proposed OLEDs were 4.5 V and 120.3 cd/m<sup>2</sup>, respectively. The underlying mechanism of the higher efficiency with ordered molecules was observed by analyzing the properties of the EML layer using AFM, SE, XRD, and an LCR meter. We confirmed that the electrical properties of the organic thin film can be improved by controlling the molecular ordering of the EML, which plays an important role in the electrical characteristics of the OLED. |
| first_indexed | 2024-03-10T11:58:09Z |
| format | Article |
| id | doaj.art-a070b0e6a5df4c8f9ab6a21d4783e9fd |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T11:58:09Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-a070b0e6a5df4c8f9ab6a21d4783e9fd2023-11-21T17:07:50ZengMDPI AGMolecules1420-30492021-04-01269251210.3390/molecules26092512Effects of MEH-PPV Molecular Ordering in the Emitting Layer on the Luminescence Efficiency of Organic Light-Emitting DiodesSeok Je Lee0Jun Li1Seung Il Lee2Chang-Bum Moon3Woo Young Kim4Jin Cao5Chul Gyu Jhun6Division of Electronic and Display Engineering, Hoseo University, Asan 31499, KoreaKey Laboratory of Advanced Display and System Applications, Shanghai University, Ministry of Education, Shanghai 200072, ChinaDivision of Electronic and Display Engineering, Hoseo University, Asan 31499, KoreaCenter for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, KoreaDivision of Electronic and Display Engineering, Hoseo University, Asan 31499, KoreaKey Laboratory of Advanced Display and System Applications, Shanghai University, Ministry of Education, Shanghai 200072, ChinaDivision of Electronic and Display Engineering, Hoseo University, Asan 31499, KoreaWe investigated the effects of molecular ordering on the electro-optical characteristics of organic light-emitting diodes (OLEDs) with an emission layer (EML) of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). The EML was fabricated by a solution process which can make molecules ordered. The performance of the OLED devices with the molecular ordering method was compared to that obtained through fabrication by a conventional spin coating method. The turn-on voltage and the luminance of the conventional OLEDs were 5 V and 34.75 cd/m<sup>2</sup>, whereas those of the proposed OLEDs were 4.5 V and 120.3 cd/m<sup>2</sup>, respectively. The underlying mechanism of the higher efficiency with ordered molecules was observed by analyzing the properties of the EML layer using AFM, SE, XRD, and an LCR meter. We confirmed that the electrical properties of the organic thin film can be improved by controlling the molecular ordering of the EML, which plays an important role in the electrical characteristics of the OLED.https://www.mdpi.com/1420-3049/26/9/2512organic light-emitting diode (OLED)molecular crystalmolecular orderingenhanced conductivityenhanced efficiency |
| spellingShingle | Seok Je Lee Jun Li Seung Il Lee Chang-Bum Moon Woo Young Kim Jin Cao Chul Gyu Jhun Effects of MEH-PPV Molecular Ordering in the Emitting Layer on the Luminescence Efficiency of Organic Light-Emitting Diodes Molecules organic light-emitting diode (OLED) molecular crystal molecular ordering enhanced conductivity enhanced efficiency |
| title | Effects of MEH-PPV Molecular Ordering in the Emitting Layer on the Luminescence Efficiency of Organic Light-Emitting Diodes |
| title_full | Effects of MEH-PPV Molecular Ordering in the Emitting Layer on the Luminescence Efficiency of Organic Light-Emitting Diodes |
| title_fullStr | Effects of MEH-PPV Molecular Ordering in the Emitting Layer on the Luminescence Efficiency of Organic Light-Emitting Diodes |
| title_full_unstemmed | Effects of MEH-PPV Molecular Ordering in the Emitting Layer on the Luminescence Efficiency of Organic Light-Emitting Diodes |
| title_short | Effects of MEH-PPV Molecular Ordering in the Emitting Layer on the Luminescence Efficiency of Organic Light-Emitting Diodes |
| title_sort | effects of meh ppv molecular ordering in the emitting layer on the luminescence efficiency of organic light emitting diodes |
| topic | organic light-emitting diode (OLED) molecular crystal molecular ordering enhanced conductivity enhanced efficiency |
| url | https://www.mdpi.com/1420-3049/26/9/2512 |
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