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OLEDs: Light Extraction and Deep Blu...

Hippola, Chamika.

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OLEDs: Light Extraction and Deep Blue Emission.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	OLEDs: Light Extraction and Deep Blue Emission./
作者:	Hippola, Chamika.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	132 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
Contained By:	Dissertations Abstracts International81-04B.
標題:	Condensed matter physics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=22583190
ISBN:	9781088335567

OLEDs: Light Extraction and Deep Blue Emission.
Hippola, Chamika.

OLEDs: Light Extraction and Deep Blue Emission. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 132 p.

Source: Dissertations Abstracts International, Volume: 81-04, Section: B.

Thesis (Ph.D.)--Iowa State University, 2019.

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

OLEDs have emerged in the market over the last decade mainly in display applications due to their unique and attractive properties, such as lightweight, high brightness with strong color contrast, thin and flexible designs as well as potentially of low cost. OLEDs for lighting applications are under extensive research and development. Though promising for solid-state lighting, there are critical aspects that need to be addressed to increase their efficiency, which will lead to commercialization.One major issue is the ~20% OLEDs' limited forward outcoupling efficiency. This is due to several loss processes. More specifically, light generated in the emissive layer is internally trapped/ waveguided in the substrate or lost to surface plasmon excitation at the metal cathode. Another issue is the less efficient and unstable blue, especially deep blue (400-450 nm), OLEDs.This dissertation addresses both of these key OLED issues.The outcoupling efficiency that is limited by the internal/ external waveguiding along with surface plasmon excitation loss was enhanced by using novel corrugated plastic substrates. The unique substrate structure enables enhanced outcoupling in the forward hemisphere by minimizing total internal reflection and surface plasmon excitation. The dissertation demonstrates OLEDs with an external quantum efficiency of 50%, meaning an outcoupling efficiency ≥ 50% for a green phosphorescent OLEDs which yields a > 2-fold enhancement over the conventional flat devices. Enhancements were observed for blue and white phosphorescent devices depending on the pitch of the corrugation and the features' height.Bright (14000 cd/m2) deep blue TADF exciplex-based OLEDs were fabricated using low cost abundant commercial organic small molecules, including triphenylphosphine oxide (PPh3O). The deep blue emission peaked at ~435 nm with the peak emission credited mainly to triplet exciplex emission at NPB/TPBi:PPh3O 5:1 interface. The triplet emission was confirmed by the strong quenching of the phosphorescence of the emitting layer in the presence of O2.

ISBN: 9781088335567Subjects--Topical Terms:

3173567
Condensed matter physics.
Subjects--Index Terms:

Bright deep blue OLEDs

OLEDs: Light Extraction and Deep Blue Emission.
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500 $a Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
500 $a Advisor: Shinar, Joseph;Shinar, Ruth.
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506 $a This item must not be sold to any third party vendors.
520 $a OLEDs have emerged in the market over the last decade mainly in display applications due to their unique and attractive properties, such as lightweight, high brightness with strong color contrast, thin and flexible designs as well as potentially of low cost. OLEDs for lighting applications are under extensive research and development. Though promising for solid-state lighting, there are critical aspects that need to be addressed to increase their efficiency, which will lead to commercialization.One major issue is the ~20% OLEDs' limited forward outcoupling efficiency. This is due to several loss processes. More specifically, light generated in the emissive layer is internally trapped/ waveguided in the substrate or lost to surface plasmon excitation at the metal cathode. Another issue is the less efficient and unstable blue, especially deep blue (400-450 nm), OLEDs.This dissertation addresses both of these key OLED issues.The outcoupling efficiency that is limited by the internal/ external waveguiding along with surface plasmon excitation loss was enhanced by using novel corrugated plastic substrates. The unique substrate structure enables enhanced outcoupling in the forward hemisphere by minimizing total internal reflection and surface plasmon excitation. The dissertation demonstrates OLEDs with an external quantum efficiency of 50%, meaning an outcoupling efficiency ≥ 50% for a green phosphorescent OLEDs which yields a > 2-fold enhancement over the conventional flat devices. Enhancements were observed for blue and white phosphorescent devices depending on the pitch of the corrugation and the features' height.Bright (14000 cd/m2) deep blue TADF exciplex-based OLEDs were fabricated using low cost abundant commercial organic small molecules, including triphenylphosphine oxide (PPh3O). The deep blue emission peaked at ~435 nm with the peak emission credited mainly to triplet exciplex emission at NPB/TPBi:PPh3O 5:1 interface. The triplet emission was confirmed by the strong quenching of the phosphorescence of the emitting layer in the presence of O2.
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