Title :
Three-Band White Light-Emitting Diodes Based on Hybridization of Polyfluorene and Colloidal CdSe–ZnS Quantum Dots
Author :
Huang, Chun-Yuan ; Huang, Tsung-Syun ; Cheng, Chiao-Yang ; Chen, Ying-Chih ; Wan, Cheng-Tien ; Rao, M. V Madhava ; Su, Yan-Kuin
Author_Institution :
Dept. of Appl. Sci., Nat. Taitung Univ., Taitung, Taiwan
fDate :
3/1/2010 12:00:00 AM
Abstract :
The authors have demonstrated the hybridization of polyfluorene (PFO) polymer light-emitting diodes with CdSe-ZnS core/shell quantum dots (QDs) in different device structures. To achieve white light emission, the green and red QDs have been incorporated into the PFO as the single emissive layer. Furthermore, the whole structures were also optimized to engineer the emission spectra. Accordingly, the incorporation of QDs increased the turn-on voltage from 10 to 23 V in device with the blend ratio of PFO : green QD : red QD being 6 : 1 : 1, while the maximum brightness was dramatically decreased.
Keywords :
II-VI semiconductors; cadmium compounds; organic light emitting diodes; semiconductor quantum dots; wide band gap semiconductors; zinc compounds; CdSe-ZnS; colloidal quantum dots; green quantum dots; polyfluorene; red quantum dots; semiconductor quantum dots; three band white light emitting diodes; white light emission; Emissive polymers; light-emitting diodes (LEDs); quantum dots (QDs);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2009.2039207
