| Presentation | 2015-05-29 Degradation analysis of near-infrared phosphorescence organic light-emitting diodes with platinum-complex emissive layer Hirotake Kajii, Tatsuya Ueda, Yutaka Ohmori, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In order to improve the device lifetime of the organic light-emitting diodes (OLEDs), it is necessary to figure out the degradation mechanism. The properties of the undoped and Pt tetraphenyltetrabenzoporphyrin (Pt(tpbp)) doped tris(8-hydroxyquinolinato)aluminum (Alq3)-based OLEDs are investigated. An Alq3 based OLED with an estimated lifetime of approximately 200 hours (time to reach 50 % of initial intensity) at 5,000 cd/m2 is obtained. On the other hand, at 200h, the output of a near-infrared device with Pt(tpbp) doped in Alq3 reaches 80 % of initial intensity. That is, the operating stability is improved for the device with Pt(tpbp) doped in Alq3. For devices with undoped Alq3, Alq3 layer acts as both the emissive and electron transport layers. Hole injection into hole transport layer gets worse after degradation. On the other hand, Pt(tpbp) acts as the carrier trap of Alq3 layer. Alq3 layer mainly acts as the electron transport layers. Photoluminescence (PL) intensity of Pt(tpbp) after degradation reaches approximately 80 % of the initial PL intensity. That is, the optical degradation of Pt(tpbp) molecules results in the decrease of EL intensity. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Organic light-emitting diode / Pt complex / Near-infrared emission / Degradation analysis / Phosphorescence |
| Paper # | OME2015-18 |
| Date of Issue | 2015-05-22 (OME) |
| Conference Information | |
| Committee | OME |
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| Conference Date | 2015/5/29(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Kikai-Shinko-Kaikan Bldg |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Organic Electronics Device, Biotechnolpgy, et al. |
| Chair | Naoki Matsuda(AIST) |
| Vice Chair | Tatsuo Mori(Aichi Inst. of Tech.) |
| Secretary | Tatsuo Mori(NTT) |
| Assistant | Hirotake Kajii(Osaka Univ.) / Dai Taguchi(Tokyo Inst. of Tech.) |
| Paper Information | |
| Registration To | Technical Committee on Organic Molecular Electronics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Degradation analysis of near-infrared phosphorescence organic light-emitting diodes with platinum-complex emissive layer |
| Sub Title (in English) | |
| Keyword(1) | Organic light-emitting diode |
| Keyword(2) | Pt complex |
| Keyword(3) | Near-infrared emission |
| Keyword(4) | Degradation analysis |
| Keyword(5) | Phosphorescence |
| 1st Author's Name | Hirotake Kajii |
| 1st Author's Affiliation | Osaka University(Osaka Univ.) |
| 2nd Author's Name | Tatsuya Ueda |
| 2nd Author's Affiliation | Osaka University(Osaka Univ.) |
| 3rd Author's Name | Yutaka Ohmori |
| 3rd Author's Affiliation | Osaka University(Osaka Univ.) |
| Date | 2015-05-29 |
| Paper # | OME2015-18 |
| Volume (vol) | vol.115 |
| Number (no) | OME-68 |
| Page | pp.pp.1-4(OME), |
| #Pages | 4 |
| Date of Issue | 2015-05-22 (OME) |