title: Electroluminescent devices with function of electro-optic shutter.
abstract: The polymer-dispersed liquid crystal (PDLC) was used as a dielectric layer of electroluminescent (EL) device to provide multi-function of electroluminescence and electro-optic shutter. A 50 μm-thick PDLC layer was formed between a transparent electrode and a ZnS:Cu phosphor layer. The electro-optic properties of the EL device were not distorted by the introduction of the PDLC layer. The extraction efficiency of luminescence was improved by more than 14% by PDLC layer. The transmittance of the PDLC was also founded not to be degraded significantly by excitation frequency. Therefore, the electroluminescence of the device was ignited by excitation frequency at a given voltage for full transparency of the PDLC. This device has great potential for applications in transparent displays with the function of a privacy window.
authors.affiliation: Division of Nano & Bio Technology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Korea.
authors.forename: Seongkyu
authors.initials: S
authors.lastname: Song
authors.forename: Jaewook
authors.initials: J
authors.lastname: Jeong
authors.forename: Seok Hwan
authors.initials: SH
authors.lastname: Chung
authors.forename: Soon Moon
authors.initials: SM
authors.lastname: Jeong
authors.forename: Byeongdae
authors.initials: B
authors.lastname: Choi
mesh_terms: D001718:Birefringence; D004563:Electrochemistry / Q000295:instrumentation*; D049449:Luminescence; D008853:Microscopy; D055095:Optics and Photonics / Q000295:instrumentation*; D011108:Polymers / Q000737:chemistry; D013050:Spectrometry, Fluorescence
chemical_list: D011108:Polymers; C422409:liquid crystal polymer