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Solution-Processed Hybrid Light-Emitting Devices Comprising TiO 2 Nanorods and WO 3 Layers as Carrier-Transporting Layers

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ABSTRACT

The goal of this research is to prepare inverted light-emitting devices with improved performance by combining titanium dioxide (TiO2) nanorods and tungsten trioxide (WO3) layer. TiO2 nanorods with different lengths were established directly on the fluorine-doped tin oxide (FTO) substrates by the hydrothermal method. The prepared TiO2 nanorods with lengths shorter than 200 nm possess transmittance higher than 80% in the visible range. Inverted light-emitting devices with the configuration of FTO/TiO2 nanorods/ionic PF/MEH-PPV/PEDOT:PSS/WO3/Au were constructed. The best device based on 100-nm-height TiO2 nanorods achieved a max brightness of 4493 cd/m2 and current efficiency of 0.66 cd/A, revealing much higher performance compared with those using TiO2 compact layer or nanorods with longer lengths as electron-transporting layers.

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a Chemical structures of organic polymers used in this study; b schematic illustration of growth process of TiO2 nanorods on the FTO substrate
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Fig2: a Chemical structures of organic polymers used in this study; b schematic illustration of growth process of TiO2 nanorods on the FTO substrate

Mentions: The light-emitting polymer poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4- phenylenevinylene) (MEH-PPV) was synthesized according to the literature [26]. PEDOT:PSS aqueous solution (CleviosTM P VP AI 4083) was purchased from Heraeus Precious Metals GmbH & Co. KG. Titanium(IV) n-butoxide and Titanium(IV) chloride was purchased from Alfa. Ammonium hexafluorophosphate was purchased from Matrix Scientific. Hydrochloric acid was purchased from ECHO Chemical. The solvents including methanol, acetonitrile, toluene, and ethanol were also purchased from ECHO Chemical. These reagents and solvents were used as received without further purification. The ionic PF carrying PF6− groups was synthesized by ionic exchange from its precursor PF-Br according to the previous literatures [27]. The detailed synthetic procedure of this ionic PF is described as follows. To a solution of PF-Br (100 mg) in methanol (20 mL) was slowly added a solution of ammonium hexafluorophosphate (0.4 g, 4.8 mmol) in methanol (20 mL). The mixture was stirred at room temperature for 48 h, followed by removing the solvent by rotary evaporation. The previous procedure was repeated for 4 or 5 times to achieve high percentage of ionic exchange from Br− to PF6−. The final product was collected and dried in an oven to give a yellow solid (90 mg, 75%). The chemical structures of the above materials are shown in Fig. 2a.Fig. 2


Solution-Processed Hybrid Light-Emitting Devices Comprising TiO 2 Nanorods and WO 3 Layers as Carrier-Transporting Layers
a Chemical structures of organic polymers used in this study; b schematic illustration of growth process of TiO2 nanorods on the FTO substrate
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC5121115&req=5

Fig2: a Chemical structures of organic polymers used in this study; b schematic illustration of growth process of TiO2 nanorods on the FTO substrate
Mentions: The light-emitting polymer poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4- phenylenevinylene) (MEH-PPV) was synthesized according to the literature [26]. PEDOT:PSS aqueous solution (CleviosTM P VP AI 4083) was purchased from Heraeus Precious Metals GmbH & Co. KG. Titanium(IV) n-butoxide and Titanium(IV) chloride was purchased from Alfa. Ammonium hexafluorophosphate was purchased from Matrix Scientific. Hydrochloric acid was purchased from ECHO Chemical. The solvents including methanol, acetonitrile, toluene, and ethanol were also purchased from ECHO Chemical. These reagents and solvents were used as received without further purification. The ionic PF carrying PF6− groups was synthesized by ionic exchange from its precursor PF-Br according to the previous literatures [27]. The detailed synthetic procedure of this ionic PF is described as follows. To a solution of PF-Br (100 mg) in methanol (20 mL) was slowly added a solution of ammonium hexafluorophosphate (0.4 g, 4.8 mmol) in methanol (20 mL). The mixture was stirred at room temperature for 48 h, followed by removing the solvent by rotary evaporation. The previous procedure was repeated for 4 or 5 times to achieve high percentage of ionic exchange from Br− to PF6−. The final product was collected and dried in an oven to give a yellow solid (90 mg, 75%). The chemical structures of the above materials are shown in Fig. 2a.Fig. 2

View Article: PubMed Central - PubMed

ABSTRACT

The goal of this research is to prepare inverted light-emitting devices with improved performance by combining titanium dioxide (TiO2) nanorods and tungsten trioxide (WO3) layer. TiO2 nanorods with different lengths were established directly on the fluorine-doped tin oxide (FTO) substrates by the hydrothermal method. The prepared TiO2 nanorods with lengths shorter than 200 nm possess transmittance higher than 80% in the visible range. Inverted light-emitting devices with the configuration of FTO/TiO2 nanorods/ionic PF/MEH-PPV/PEDOT:PSS/WO3/Au were constructed. The best device based on 100-nm-height TiO2 nanorods achieved a max brightness of 4493 cd/m2 and current efficiency of 0.66 cd/A, revealing much higher performance compared with those using TiO2 compact layer or nanorods with longer lengths as electron-transporting layers.

No MeSH data available.