Efficient, Nonintrusive Outcoupling in Organic Light Emitting Devices Using Embedded Microlens Arrays

Yue Qu; Jongchan Kim; Caleb Coburn; Stephen R. Forrest

doi:10.1021/acsphotonics.8b00255

Efficient, Nonintrusive Outcoupling in Organic Light Emitting Devices Using Embedded Microlens Arrays

Yue Qu, Jongchan Kim, Caleb Coburn, Stephen R. Forrest

Department of Integrated Display Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

We demonstrate efficient light extraction from the active region of bottom-emitting organic light emitting devices (OLEDs) using a high refractive index, nondiffractive hemispherical microlens array located between the transparent anode and embedded in the low refractive index glass substrate (n = 1.5). The subelectrode microlens array (SEMLA) results in a maximum external quantum efficiency of 70 ± 4% for green phosphorescent OLEDs (PHOLEDs). Furthermore, the wavelength- and viewing-angle-independent light extraction structure results in white PHOLED external efficiencies of 50 ± 3%. The SEMLA light extraction structure is nonintrusive; that is, it lies completely outside of the OLED structure. Since this design has no effect on the image resolution, it is compatible with applications for both displays and white light illumination, with no dependence on molecular transition dipole orientation and the active organic layers (and hence diode electrical characteristics) used in the PHOLED. Finally, due to the micrometer-scale feature size of the SEMLA, it is achieved using conventional photolithography prior to the OLED array deposition.

Original language	English
Pages (from-to)	2453-2458
Number of pages	6
Journal	ACS Photonics
Volume	5
Issue number	6
DOIs	https://doi.org/10.1021/acsphotonics.8b00255
Publication status	Published - 2018 Jun 20

Bibliographical note

Funding Information:
The authors acknowledge the financial support by the United States Department of Energy Solid-State Lighting program under Award DE-EE0007626 and Universal Display Corp. This work was performed in part at the University of Michigan Lurie Nanofabrication Facility.

Publisher Copyright:
© 2018 American Chemical Society.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Biotechnology
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

Access to Document

10.1021/acsphotonics.8b00255

Cite this

@article{919d75e26dce4b9eb5fbde15a280bb42,

title = "Efficient, Nonintrusive Outcoupling in Organic Light Emitting Devices Using Embedded Microlens Arrays",

abstract = "We demonstrate efficient light extraction from the active region of bottom-emitting organic light emitting devices (OLEDs) using a high refractive index, nondiffractive hemispherical microlens array located between the transparent anode and embedded in the low refractive index glass substrate (n = 1.5). The subelectrode microlens array (SEMLA) results in a maximum external quantum efficiency of 70 ± 4% for green phosphorescent OLEDs (PHOLEDs). Furthermore, the wavelength- and viewing-angle-independent light extraction structure results in white PHOLED external efficiencies of 50 ± 3%. The SEMLA light extraction structure is nonintrusive; that is, it lies completely outside of the OLED structure. Since this design has no effect on the image resolution, it is compatible with applications for both displays and white light illumination, with no dependence on molecular transition dipole orientation and the active organic layers (and hence diode electrical characteristics) used in the PHOLED. Finally, due to the micrometer-scale feature size of the SEMLA, it is achieved using conventional photolithography prior to the OLED array deposition.",

author = "Yue Qu and Jongchan Kim and Caleb Coburn and Forrest, {Stephen R.}",

note = "Funding Information: The authors acknowledge the financial support by the United States Department of Energy Solid-State Lighting program under Award DE-EE0007626 and Universal Display Corp. This work was performed in part at the University of Michigan Lurie Nanofabrication Facility. Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

month = jun,

day = "20",

doi = "10.1021/acsphotonics.8b00255",

language = "English",

volume = "5",

pages = "2453--2458",

journal = "ACS Photonics",

issn = "2330-4022",

publisher = "American Chemical Society",

number = "6",

}

TY - JOUR

T1 - Efficient, Nonintrusive Outcoupling in Organic Light Emitting Devices Using Embedded Microlens Arrays

AU - Qu, Yue

AU - Kim, Jongchan

AU - Coburn, Caleb

AU - Forrest, Stephen R.

N1 - Funding Information: The authors acknowledge the financial support by the United States Department of Energy Solid-State Lighting program under Award DE-EE0007626 and Universal Display Corp. This work was performed in part at the University of Michigan Lurie Nanofabrication Facility. Publisher Copyright: © 2018 American Chemical Society.

PY - 2018/6/20

Y1 - 2018/6/20

N2 - We demonstrate efficient light extraction from the active region of bottom-emitting organic light emitting devices (OLEDs) using a high refractive index, nondiffractive hemispherical microlens array located between the transparent anode and embedded in the low refractive index glass substrate (n = 1.5). The subelectrode microlens array (SEMLA) results in a maximum external quantum efficiency of 70 ± 4% for green phosphorescent OLEDs (PHOLEDs). Furthermore, the wavelength- and viewing-angle-independent light extraction structure results in white PHOLED external efficiencies of 50 ± 3%. The SEMLA light extraction structure is nonintrusive; that is, it lies completely outside of the OLED structure. Since this design has no effect on the image resolution, it is compatible with applications for both displays and white light illumination, with no dependence on molecular transition dipole orientation and the active organic layers (and hence diode electrical characteristics) used in the PHOLED. Finally, due to the micrometer-scale feature size of the SEMLA, it is achieved using conventional photolithography prior to the OLED array deposition.

AB - We demonstrate efficient light extraction from the active region of bottom-emitting organic light emitting devices (OLEDs) using a high refractive index, nondiffractive hemispherical microlens array located between the transparent anode and embedded in the low refractive index glass substrate (n = 1.5). The subelectrode microlens array (SEMLA) results in a maximum external quantum efficiency of 70 ± 4% for green phosphorescent OLEDs (PHOLEDs). Furthermore, the wavelength- and viewing-angle-independent light extraction structure results in white PHOLED external efficiencies of 50 ± 3%. The SEMLA light extraction structure is nonintrusive; that is, it lies completely outside of the OLED structure. Since this design has no effect on the image resolution, it is compatible with applications for both displays and white light illumination, with no dependence on molecular transition dipole orientation and the active organic layers (and hence diode electrical characteristics) used in the PHOLED. Finally, due to the micrometer-scale feature size of the SEMLA, it is achieved using conventional photolithography prior to the OLED array deposition.

UR - http://www.scopus.com/inward/record.url?scp=85046436451&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85046436451&partnerID=8YFLogxK

U2 - 10.1021/acsphotonics.8b00255

DO - 10.1021/acsphotonics.8b00255

M3 - Article

AN - SCOPUS:85046436451

SN - 2330-4022

VL - 5

SP - 2453

EP - 2458

JO - ACS Photonics

JF - ACS Photonics

IS - 6

ER -

Efficient, Nonintrusive Outcoupling in Organic Light Emitting Devices Using Embedded Microlens Arrays

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this