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Proceedings Paper

Two-color emission in three-layer heterostructure OLETs
Author(s): K. Jokinen; A. Bykov; T. Fabritius; R. Myllylä
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Paper Abstract

Two-color emission was observed in three-layer heterostructure organic light emitting transistors (OLETs). These devices consisted of a light-emitting layer made of tris(8-hydroxyquinolinato)aluminium (Alq3) doped with 4-(dicyanomethylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM), sandwiched between hole and electron transport layers made of α,ω-dihexyl-quaterthiophene (DH-4T) and α,ω-diperfluorohexyl-quaterthiophene (DFH-4T), respectively. Ambipolar transfer curves were recorded from the fabricated devices, and two-color emission (red and green) was observed during transfer curve acquisition. Red emission was observed to take place at bias conditions supporting hole transport, while green emission occurred when electron-based current was dominant. Moreover, red emission originated from the Alq3:DCM layer, which was verified by comparing the measured spectrum of OLETs to that of corresponding Alq3:DCM organic light-emitting diodes (OLEDs). To investigate the origin of green emission, OLETs were fabricated without an electron transport layer. No green emission was observed, while red emission remained unchanged. Moreover, single-layer transistors and diodes fabricated from DFH-4T expressed green color emission similar to that of three-layer heterostructure OLETs. Therefore, we suggest that green emission originates from the electron transport layer.

Paper Details

Date Published: 8 October 2014
PDF: 7 pages
Proc. SPIE 9183, Organic Light Emitting Materials and Devices XVIII, 91831Q (8 October 2014); doi: 10.1117/12.2060661
Show Author Affiliations
K. Jokinen, Univ. of Oulu (Finland)
A. Bykov, Univ. of Oulu (Finland)
T. Fabritius, Univ. of Oulu (Finland)
R. Myllylä, Univ. of Oulu (Finland)

Published in SPIE Proceedings Vol. 9183:
Organic Light Emitting Materials and Devices XVIII
Franky So; Chihaya Adachi, Editor(s)

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