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Paper Abstract and Keywords
Presentation 2021-03-02 09:40
[Invited Lecture] Analysis of OLEDs using delayed luminescence method
Noriyuki Takada, Hajime Okumoto (AIST) OME2020-26
Abstract (in Japanese) (See Japanese page) 
(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) 
(in English) delayed emission / FT interferometer / phosphorescence / charge-recombination / charge trap / / /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 383, OME2020-26, pp. 28-30, March 2021.
Paper # OME2020-26 
Date of Issue 2021-02-22 (OME) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF OME2020-26

Conference Information
Committee OME IEE-DEI  
Conference Date 2021-03-01 - 2021-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Organic Molecular Electronics 
Paper Information
Registration To OME 
Conference Code 2021-03-OME-DEI 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) 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  
Keyword(6)  
Keyword(7)  
Keyword(8)  
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)
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Speaker Author-1 
Date Time 2021-03-02 09:40:00 
Presentation Time 20 minutes 
Registration for OME 
Paper # OME2020-26 
Volume (vol) vol.120 
Number (no) no.383 
Page pp.28-30 
#Pages 3 
Date of Issue 2021-02-22 (OME) 

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