Sharply directed emission in microcavity organic light-emitting diodes with a cholesteric liquid crystal film
✍ Scribed by Soon Moon Jeong; Yoichi Takanishi; Ken Ishikawa; Suzushi Nishimura; Goroh Suzaki; Hideo Takezoe
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 693 KB
- Volume
- 273
- Category
- Article
- ISSN
- 0030-4018
No coin nor oath required. For personal study only.
✦ Synopsis
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 (Alq 3 ), 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.