Open AccessImproved performance of white polymer light emitting diodes
Author(s) -
Jianhua Zou,
Hong Tao,
Hongbin Wu,
Junbiao Peng
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.1224
Subject(s) - materials science , luminance , bilayer , pedot:pss , cathode , polymer , layer (electronics) , optoelectronics , diode , coating , white light , optics , composite material , membrane , chemistry , physics , biochemistry
White polymer light-emitting diodes (WPLEDs) with bilayer structure were fabricated by spin coating method using polymers of different solubilities. The device structure used here is ITO/PEDOT(50nm)/PVK∶PFO-BT∶PFO-DBT(40nm)/PFO(40nm)/Ba(4nm)/Al(120nm)at the weight ratio of 100∶4∶3 (PVK∶PFO-BT∶PFO-DBT). White fluorescent light emission with CIE coordinates of (0.33, 0.34) is achieved, and the maximal luminance efficiency of 2.4 cd/A and the maximal luminance of 3215 cd/m2 are obtained. By attaching a layer of water-soluble electronic transporting material of PFN to the cathode, the maximal luminance efficiencies increase up to 5.28 cd/A with CIE coordinates kept at (0.34, 0.36), and the device stabitity is also improved.