Sharply directed emission in microcavity organic light-emitting diodes with a cholesteric liquid crystal film

Soon Moon Jeong, Yoichi Takanishi, Ken Ishikawa, Suzushi Nishimura, Goroh Suzaki, Hideo Takezoe

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

A flexible microcavity organic light-emitting diode (OLED) was fabricated and the emitting characteristics were examined. A pair of right- and left-handed cholesteric liquid crystal (CLC) films were attached to the microcavity OLED between aluminum (Al) and silver (Ag). Sharply directed spontaneous emission was observed from microcavity OLEDs, in which a typical luminescent material, 8-hydroxyquinoline aluminum (Alq3), with a broad emission spectrum was used for emitting layer. The introduction of the CLC film improved both the emission bandwidth and directionality, preserving the turn-on voltage and maximum brightness.

Original languageEnglish
Pages (from-to)167-172
Number of pages6
JournalOptics Communications
Volume273
Issue number1
DOIs
StatePublished - 1 May 2007

Bibliographical note

Funding Information:
This work is partly supported by 21st century COE program, a Grant-in-Aid for Exploratory Research (16656023) by the Ministry of Education, Science, Sports and Culture, and NEDO (New Energy Technology Development Organization) Grant (Project ID 04A24509).

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