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Microbes based printing for fabrication of microlenses for organic light emitting diodes.

Sunita, Mehta and Saravanan, M. and Balaji, Prakash and Mr, Deepak (2016) Microbes based printing for fabrication of microlenses for organic light emitting diodes. Organic Electronics, 35. pp. 199-207.

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Abstract

We have demonstrated a novel method to fabricate microlenses for organic light emitting diodes (OLEDs) using templates of patterned microbes. Saccharomyces cerevisiae (Baker’s yeast), generally used in a microbiology laboratory, is allowed or restricted to grow in selected areas on a polyvinylidene fluoride (PVDF) membrane, which acts as a substrate. The process comprises of two autonomous approaches, namely, microbial and antimicrobial approaches, which employ inkjet printing for dispensing a suitable ink. The ink is a culture of microbes in the case of microbial approach and an antimicrobial agent in the antimicrobial approach. Once a three dimensional pattern evolves as a consequence of microbial growth, the substrate serves as a template for casting polydimethyl siloxane (PDMS) microlenses. Among the two approaches, antimicrobial approach presents a pattern with low packing density of microlenses. But, microbial approach results into a densely packed array of microlenses with a significant randomness in the distribution of their diameter and height, as required for efficient light out-coupling. The microlenses obtained from both the approaches are attached to the air side of the glass in all three red, green and blue OLEDs. The luminance was measured with and without these microlenses. A maximum enhancement of 1.24X was attained.

Item Type: Article
Uncontrolled Keywords: Microlenses Organic light emitting diodes Microbes Inkjet printing
Subjects: 500 Natural Sciences and Mathematics > 07 Life Sciences > 04 Microbiology
Divisions: Molecular Nutrition
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 19 Jan 2018 08:12
Last Modified: 19 Jan 2018 08:12
URI: http://ir.cftri.com/id/eprint/13339

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