ABSTRACT In this work, a new flexible and transparent substrate with the help of organic materials such as Polydimethylsiloxane (PDMS) and Tetra ethoxy orthosilicate (TEOS) is synthesized. Transmittance of about 90-95 % is obtained in the visible region (400-700 nm) and the synthesized substrate show better thermal characteristics and withstands temperature upto 200 oC without any significant degradation. Characteristics such as transmittance (T), absorption (A), refractive index (n) and extinction coefficient (k) are also reported.
Keywords: ); Flexible Polymer Substrate, Polydimethylsiloxane (PDMS), Thin Films, Organic Light Emitting diodes (OLEDs),Transmittance.
1. Introduction
Organic light-emitting devices (OLED) have attracted …show more content…
A 1 grams of PDMS is taken in a beaker and allowed to dissolve in toluene for few minutes, after obtaining a clear solution, cross linker tetraethylorthosilicate (TEOS) of 0.5gm is added to the mixture and it is sonicated for few minutes then finally curing agent is added and once again it is sonicated for few minutes and it is coated on Teflon sheet or glass using doctor blade method to obtain a uniform thickness of 0.5 mm. Then it is allowed to dry at room temperature for few hours and a free standing film of 0.5 mm thickness is peeled off from the glass. Figure 1 show the photographic image of the as-prepared …show more content…
The refractive index of the substrate is found to be 1.5 throughout the entire visible region which is approximately close to glass makes it to be suitable for opto-electronic device applications. Fig.2 (a): Transmittance (b) Absorbance Spectra of the PDMS film
Figure 3 (a) and (b) shows the DSC and TG-DTG curve (thermal characteristics) of the substrate respectively. TG-DTG curve of films shows that there is only 0.2 % weight loss upto 100 oC and there is a loss of 0.7 % and 2 % in the range of 150 oC and 200 oC respectively and finally at the temperature of 300 oC there is a weight loss of around 5 % is noted which states that the PDMS based film has better thermal stability compared to flexible plastic substrate. Hence the synthesized film can be used for the fabrication of the OLEDs and OPVs which requires high processing temperature for the fabrication process.
Fig.3 (a): DSC-DDSC curve (b) TG-DTG curve of the PDMS film
4.
Keywords: ); Flexible Polymer Substrate, Polydimethylsiloxane (PDMS), Thin Films, Organic Light Emitting diodes (OLEDs),Transmittance.
1. Introduction
Organic light-emitting devices (OLED) have attracted …show more content…
A 1 grams of PDMS is taken in a beaker and allowed to dissolve in toluene for few minutes, after obtaining a clear solution, cross linker tetraethylorthosilicate (TEOS) of 0.5gm is added to the mixture and it is sonicated for few minutes then finally curing agent is added and once again it is sonicated for few minutes and it is coated on Teflon sheet or glass using doctor blade method to obtain a uniform thickness of 0.5 mm. Then it is allowed to dry at room temperature for few hours and a free standing film of 0.5 mm thickness is peeled off from the glass. Figure 1 show the photographic image of the as-prepared …show more content…
The refractive index of the substrate is found to be 1.5 throughout the entire visible region which is approximately close to glass makes it to be suitable for opto-electronic device applications. Fig.2 (a): Transmittance (b) Absorbance Spectra of the PDMS film
Figure 3 (a) and (b) shows the DSC and TG-DTG curve (thermal characteristics) of the substrate respectively. TG-DTG curve of films shows that there is only 0.2 % weight loss upto 100 oC and there is a loss of 0.7 % and 2 % in the range of 150 oC and 200 oC respectively and finally at the temperature of 300 oC there is a weight loss of around 5 % is noted which states that the PDMS based film has better thermal stability compared to flexible plastic substrate. Hence the synthesized film can be used for the fabrication of the OLEDs and OPVs which requires high processing temperature for the fabrication process.
Fig.3 (a): DSC-DDSC curve (b) TG-DTG curve of the PDMS film
4.