Electroluminescence enhancement of the phosphor dispersed in a polymer matrix using the tandem structure

✍ Scribed by Jin-Young Kim; Min Jong Bae; Shang Hyeun Park; Taewon Jeong; Sunjin Song; Jeonghee Lee; Intaek Han; Ji Beom Yoo; Donggeun Jung; SeGi Yu

• Book ID: 103877521
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 610 KB
• Volume: 12
• Category: Article
• ISSN: 1566-1199
• DOI: 10.1016/j.orgel.2010.12.020

✦ Synopsis

An alternating current driven electroluminescence (EL) device consisting of a phosphor dispersed in a polymer matrix device was fabricated as a tandem structure. This structure can be formed by duplicating the emitting and conducting layers. The EL device with the tandem structure, particularly the device with the triple emitting layer, was six times brighter than (1460 cd/m 2 at an alternating voltage application of 50 V) the structure with a single emitting layer. This tandem structure plays important roles by increasing the chance of electron-hole tunneling into the phosphor with leading to an increase in brightness by combining the light emitted from several emitting layers in a device. In addition, the adoption of a spin-coating method for the deposition of an emitting layer can allow the production of a dielectric part on the lower-lying emitting phosphor powder particles. The implementation of a dielectric part and emitting part by one spin-coating procedure simplifies the overall fabrication process, particularly for the tandem structure. The significant increase in brightness with each additional emitting layer as well as a facile fabrication process would help to make the EL device a competitive candidate in future displays and lightings.