Fluorescence/phosphorescence hybrid white organic light-emitting devices (WOLEDs) with non-doped emitting layers are constructed based on blue, green and red dyes. The simplified emitting layers (EMLs) are fabricated with structure of Blue/Red/Blue/Green hybrid emitting layers consisting of an ultrathin non-doped green phosphorescence layer employing Tris(2-phenylpyridine)iridium (Ir(ppy)3), an ultrathin non-doped red phosphorescence layer using Tris(1-(4-hexylphenyl)-isoquinolinato-C2,N)iridium(III) (Ir(h-piq)3), and double non-doped blue thermally activated delayed fluorescence (TADF) layers using 9,9-dimethyl-9,10-dihydroacridine- diphenylsulfone (DMAC-DPS). A white OLED are fabricated with relatively stable electroluminescence spectra of white emission achieves maximum luminance, maximum current efficiency, power efficiency and external quantum efficiency of 21596cd/m2, 8.45 cd/A, 11.57 lm/W and 6%, respectively. The result shows a slight variation of Commission International de l’Eclairage (CIE) coordinates (0.026, 0.051) at a luminance ranging from 32 cd/m2 to 2728 cd/m2. It suggests that the bipolar charge carrier transport property of DMAC-DPS contributes to control of exciton recombination in the emissive regions and balance white emission.
We have fabricated poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3000-di(2-octyldodecyl)- 2,20;50,200;500,2000-quaterthiophen-5,5000-diyl)] PffBT4T-2OD/fullerene (C60)/[6,6]-phenyl C71-butyric acid methyl ester (PC71BM) ternary blend films. The thin films have been characterized by atomic force microscope (AFM) and ultraviolet/visible spectroscopy in order to study the influence of C60 doping on the morphological and optical properties of the active layer. The results show the incorporation of C60 into PffBT4T-2OD : PC71BM thin film improves the photovoltaic characteristics and shows preferable morphology. Furthermore, we demonstrate the addition of C60 can suppress bimolecular recombination and thus enhanced FF. This work illustrates a valuable strategy towards thick film OSCs with high-performances.
Organic-inorganic hybrid perovskites have been emerging as promising emitting materials for light-emitting diodes due to their miraculous optoelectronic properties. Conventional electron transporting materials used in organic light emitting diodes (OLEDs) such as 1,3,5-tris(2-N-phenylbenzimidazolyl) benzene (TPBi), 4,7-diphenyl-1,10-phenanthroline (Bphen), 1,3,5-tri(m-pyrid-3-yl-phenyl) benzene (TmPyPB), and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) have been used as electron transporting layer (ETL) in the perovskite light emitting diodes (PeLEDs). However, there exit few systematic analysis about different ETL materials on the performance of PeLED. In this work, we employ TPBi, BPhen, TmPyPB, and BCP as ETL material of PeLED, respectively. Owing to the high electron mobility and suitable energy level, BPhen PeLED express the best performance at the same thickness with a maximum luminance of 812 cd m2 and current efficiency (CE) of 0.1 cd A-1. Hence, this work provides a useful method on device architecture construction for the realization of high performance PeLEDs.
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