Improved light outcoupling and mode analysis of top-emitting OLEDs on periodically corrugated substrates

Tobias Schwab; Cornelius Fuchs; Reinhard Scholz; Xuan Hua Li; Fengxian Xie; Wallace Choy; Karl Leo; Malte C. Gather

doi:10.1117/12.2023222

Improved light outcoupling and mode analysis of top-emitting OLEDs on periodically corrugated substrates

Tobias Schwab, Cornelius Fuchs, Reinhard Scholz, Xuan Hua Li, Fengxian Xie, Wallace Choy, Karl Leo, Malte C. Gather

Research output: Contribution to journal › Conference article › peer-review

6 Scopus citations

Abstract

Bragg scattering by one dimensional periodic structures is investigated in order to enhance the outcoupling effciency of optically optimized planar top-emitting OLEDs. Using a soft imprint process, we fabricate extremely homogeneous gratings with sub-μm period. These gratings are integrated beneath the bottom contact of topemitting OLEDs, without affecting the electrical device performance. The reflective contacts of the top emission geometry introduce pronounced micro-cavity effects for directly outcoupled and internally trapped light modes. Bragg scattering of the trapped waveguided and surface plasmon modes into the air cone, i.e. the forward direction, leads to interference with the directly outcoupled mode. As a result, constructive and destructive interference of the modes is detected and analyzed. Overall, we find that the introduction of shallow one dimensional sub- m periodic grating structures underneath top-emitting OLEDs leads to an EQE and luminous efficacy enhancement by up to 42%.

Original language	English
Article number	88291I
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	8829
DOIs	https://doi.org/10.1117/12.2023222
State	Published - 2013
Externally published	Yes
Event	Organic Light Emitting Materials and Devices XVII - San Diego, CA, United States Duration: 25 Aug 2013 → 28 Aug 2013

Keywords

Bragg scattering
Mode analysis
Periodic corrugation
Top-emitting OLEDs

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10.1117/12.2023222

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title = "Improved light outcoupling and mode analysis of top-emitting OLEDs on periodically corrugated substrates",

abstract = "Bragg scattering by one dimensional periodic structures is investigated in order to enhance the outcoupling effciency of optically optimized planar top-emitting OLEDs. Using a soft imprint process, we fabricate extremely homogeneous gratings with sub-μm period. These gratings are integrated beneath the bottom contact of topemitting OLEDs, without affecting the electrical device performance. The reflective contacts of the top emission geometry introduce pronounced micro-cavity effects for directly outcoupled and internally trapped light modes. Bragg scattering of the trapped waveguided and surface plasmon modes into the air cone, i.e. the forward direction, leads to interference with the directly outcoupled mode. As a result, constructive and destructive interference of the modes is detected and analyzed. Overall, we find that the introduction of shallow one dimensional sub- m periodic grating structures underneath top-emitting OLEDs leads to an EQE and luminous efficacy enhancement by up to 42%.",

keywords = "Bragg scattering, Mode analysis, Periodic corrugation, Top-emitting OLEDs",

author = "Tobias Schwab and Cornelius Fuchs and Reinhard Scholz and Li, {Xuan Hua} and Fengxian Xie and Wallace Choy and Karl Leo and Gather, {Malte C.}",

year = "2013",

doi = "10.1117/12.2023222",

language = "英语",

volume = "8829",

journal = "Proceedings of SPIE - The International Society for Optical Engineering",

issn = "0277-786X",

publisher = "SPIE",

note = "Organic Light Emitting Materials and Devices XVII ; Conference date: 25-08-2013 Through 28-08-2013",

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TY - JOUR

T1 - Improved light outcoupling and mode analysis of top-emitting OLEDs on periodically corrugated substrates

AU - Schwab, Tobias

AU - Fuchs, Cornelius

AU - Scholz, Reinhard

AU - Li, Xuan Hua

AU - Xie, Fengxian

AU - Choy, Wallace

AU - Leo, Karl

AU - Gather, Malte C.

PY - 2013

Y1 - 2013

N2 - Bragg scattering by one dimensional periodic structures is investigated in order to enhance the outcoupling effciency of optically optimized planar top-emitting OLEDs. Using a soft imprint process, we fabricate extremely homogeneous gratings with sub-μm period. These gratings are integrated beneath the bottom contact of topemitting OLEDs, without affecting the electrical device performance. The reflective contacts of the top emission geometry introduce pronounced micro-cavity effects for directly outcoupled and internally trapped light modes. Bragg scattering of the trapped waveguided and surface plasmon modes into the air cone, i.e. the forward direction, leads to interference with the directly outcoupled mode. As a result, constructive and destructive interference of the modes is detected and analyzed. Overall, we find that the introduction of shallow one dimensional sub- m periodic grating structures underneath top-emitting OLEDs leads to an EQE and luminous efficacy enhancement by up to 42%.

AB - Bragg scattering by one dimensional periodic structures is investigated in order to enhance the outcoupling effciency of optically optimized planar top-emitting OLEDs. Using a soft imprint process, we fabricate extremely homogeneous gratings with sub-μm period. These gratings are integrated beneath the bottom contact of topemitting OLEDs, without affecting the electrical device performance. The reflective contacts of the top emission geometry introduce pronounced micro-cavity effects for directly outcoupled and internally trapped light modes. Bragg scattering of the trapped waveguided and surface plasmon modes into the air cone, i.e. the forward direction, leads to interference with the directly outcoupled mode. As a result, constructive and destructive interference of the modes is detected and analyzed. Overall, we find that the introduction of shallow one dimensional sub- m periodic grating structures underneath top-emitting OLEDs leads to an EQE and luminous efficacy enhancement by up to 42%.

KW - Bragg scattering

KW - Mode analysis

KW - Periodic corrugation

KW - Top-emitting OLEDs

UR - http://www.scopus.com/inward/record.url?scp=84889062656&partnerID=8YFLogxK

U2 - 10.1117/12.2023222

DO - 10.1117/12.2023222

M3 - 会议文章

AN - SCOPUS:84889062656

SN - 0277-786X

VL - 8829

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

M1 - 88291I

T2 - Organic Light Emitting Materials and Devices XVII

Y2 - 25 August 2013 through 28 August 2013

ER -

Improved light outcoupling and mode analysis of top-emitting OLEDs on periodically corrugated substrates

Abstract

Keywords

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