| Presentation | 2021-03-02 [Invited Lecture] Analysis of OLEDs using delayed luminescence method Noriyuki Takada, Hajime Okumoto, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | By applying the delayed emission method to the Alq3 organic EL device, we succeeded in measuring the emission spectrum with a delay time exceeding 10ms ~ about 10 minutes after the applied voltage was turned off. Due to detect remarkable weak light, we have utilized a highly sensitive Fourier transform interference spectrometer. The emission spectra measured at a short delay time less than 10ms were almost the same as the steady-state EL spectrum. This fact suggests the formation of delayed-fluorescence via triplet-triplet annihilation. On the other hand, when the delay time exceeds 10ms, a red-shifted emission spectrum clearly different from the fluorescence spectrum was obtained. This emission would be produced by charge recombination at the deep trap state. Unlike free-charge recombination, it cannot provide the energy required for S1 level formation, but it suggests that the T1 level can be excited. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | delayed emission / FT interferometer / phosphorescence / charge-recombination / charge trap |
| Paper # | OME2020-26 |
| Date of Issue | 2021-02-22 (OME) |
| Conference Information | |
| Committee | OME / IEE-DEI |
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| Conference Date | 2021/3/1(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Organic Molecular Electronics |
| Chair | Yutaka Majima(Tokyo Inst. of Tech.) / 早川 直樹(名古屋大学) |
| Vice Chair | Toshiki Yamada(NICT) |
| Secretary | Toshiki Yamada(Osaka Univ.) / (Tokyo Inst. of Tech.) |
| Assistant | Toshihiko Kaji(Tokyo Univ. of Agriculture and Tech.) / Yoshiyuki Seike(Aichi Inst. of Tech.) / 早瀬 悠二(富士電機) / 村上 義信(豊橋技術科学大学) |
| Paper Information | |
| Registration To | Technical Committee on Organic Molecular Electronics / Technical Meeting on Dielectrics and Electrical Insulation |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | [Invited Lecture] Analysis of OLEDs using delayed luminescence method |
| Sub Title (in English) | |
| Keyword(1) | delayed emission |
| Keyword(2) | FT interferometer |
| Keyword(3) | phosphorescence |
| Keyword(4) | charge-recombination |
| Keyword(5) | charge trap |
| 1st Author's Name | Noriyuki Takada |
| 1st Author's Affiliation | National Institute of Advanced Industrial Science and Technology(AIST) |
| 2nd Author's Name | Hajime Okumoto |
| 2nd Author's Affiliation | National Institute of Advanced Industrial Science and Technology(AIST) |
| Date | 2021-03-02 |
| Paper # | OME2020-26 |
| Volume (vol) | vol.120 |
| Number (no) | OME-383 |
| Page | pp.pp.28-30(OME), |
| #Pages | 3 |
| Date of Issue | 2021-02-22 (OME) |