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Plastic Substrate Design for Enhance...

Kaudal, Rajiv.

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Plastic Substrate Design for Enhanced Light Outcoupling from Organic Light Emitting Diodes (OLEDs).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Plastic Substrate Design for Enhanced Light Outcoupling from Organic Light Emitting Diodes (OLEDs)./
Author:	Kaudal, Rajiv.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	127 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-01, Section: B.
Contained By:	Dissertations Abstracts International82-01B.
Subject:	Physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27832470
ISBN:	9798617007284

Plastic Substrate Design for Enhanced Light Outcoupling from Organic Light Emitting Diodes (OLEDs).
Kaudal, Rajiv.

Plastic Substrate Design for Enhanced Light Outcoupling from Organic Light Emitting Diodes (OLEDs). - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 127 p.

Source: Dissertations Abstracts International, Volume: 82-01, Section: B.

Thesis (Ph.D.)--Iowa State University, 2020.

This item must not be sold to any third party vendors.

Enhancing light extraction from Organic Light Emitting Diodes (OLEDs) is an ongoing scientific and industrial challenge that is particularly important for lighting applications. Light extraction, or the outcoupling factor ηout of conventional OLEDs devoid of any extraction means is limited to ~20%. This limit stems mainly from three photon loss processes: (i) so-called "external" waveguiding in the substrate, (ii) internal waveguiding in the high refractive index anode and organic layers, and (iii) excitation of surface plasmon polaritons at the metal cathode/organic interface. The ~30% external waveguided light can be extracted via a microlens array or a hemispherical lens at the air-side of the OLEDs' substrate. However, mitigating the internal waveguided light and surface plasmon excitation losses, which amount to ~50% of the lost photons, in a cost-effective approach remains a challenge. Substrate corrugation is one of the innovative approaches used for addressing this issue. In this work, corrugated plastic substrates of polycarbonate and polyethylene terephthalate/cellulose acetate butyrate of various designs, such as different patterns' height and periodicity, were evaluated. Detailed substrates' design is a crucial metric for device performance; hence it requires in-depth analysis. Tapping mode atomic force microcopy (AFM) was used for probing the geometry, uniformity, and smoothness of the various plastic substrates. The essence of the work performed in this dissertation is combining promising substrate designs with carefully stacked green and white OLEDs that resulted in ~2x enhancements in ηout due to the patterns only, i.e., without additional means for extracting the externally waveguided light. In addition to broad optoelectronic characterization of the OLEDs, analyses of device stack conformality and top surface structure were performed via focused ion beam, SEM and AFM techniques.

ISBN: 9798617007284Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Atomic force microscopy

Plastic Substrate Design for Enhanced Light Outcoupling from Organic Light Emitting Diodes (OLEDs).
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245 1 0 $a Plastic Substrate Design for Enhanced Light Outcoupling from Organic Light Emitting Diodes (OLEDs).
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300 $a 127 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-01, Section: B.
500 $a Advisor: Shinar, Joseph;Shinar, Ruth.
502 $a Thesis (Ph.D.)--Iowa State University, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a Enhancing light extraction from Organic Light Emitting Diodes (OLEDs) is an ongoing scientific and industrial challenge that is particularly important for lighting applications. Light extraction, or the outcoupling factor ηout of conventional OLEDs devoid of any extraction means is limited to ~20%. This limit stems mainly from three photon loss processes: (i) so-called "external" waveguiding in the substrate, (ii) internal waveguiding in the high refractive index anode and organic layers, and (iii) excitation of surface plasmon polaritons at the metal cathode/organic interface. The ~30% external waveguided light can be extracted via a microlens array or a hemispherical lens at the air-side of the OLEDs' substrate. However, mitigating the internal waveguided light and surface plasmon excitation losses, which amount to ~50% of the lost photons, in a cost-effective approach remains a challenge. Substrate corrugation is one of the innovative approaches used for addressing this issue. In this work, corrugated plastic substrates of polycarbonate and polyethylene terephthalate/cellulose acetate butyrate of various designs, such as different patterns' height and periodicity, were evaluated. Detailed substrates' design is a crucial metric for device performance; hence it requires in-depth analysis. Tapping mode atomic force microcopy (AFM) was used for probing the geometry, uniformity, and smoothness of the various plastic substrates. The essence of the work performed in this dissertation is combining promising substrate designs with carefully stacked green and white OLEDs that resulted in ~2x enhancements in ηout due to the patterns only, i.e., without additional means for extracting the externally waveguided light. In addition to broad optoelectronic characterization of the OLEDs, analyses of device stack conformality and top surface structure were performed via focused ion beam, SEM and AFM techniques.
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