Top-emission organic light emitting diodes with lower viewing angle dependence

Byung Wan Lim; Hyeon Soo Jeon; Min Chul Suh

doi:10.1016/j.synthmet.2013.12.020

Top-emission organic light emitting diodes with lower viewing angle dependence

Byung Wan Lim, Hyeon Soo Jeon, Min Chul Suh

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

22 Citations (Scopus)

Abstract

We obtained nanoporous polymer film which has 20-30% optical haze to suppress the viewing angle dependency of a top emission organic light emitting diode (TOLED) with strong microcavity effect. We controlled the sizes and density of nanopores by changing the spin coating condition such as spinning duration and spin rate in highly humid atmosphere up to 90% relative humidity condition. The resultant nanoporous polymer film has effectively reduced viewing angle dependency of microcavity TOLEDs without any serious decrease in total intensity of out-coupled light observed from the integrating sphere although the luminance observed from the front side was diminished slightly. Despite its negative effect on the efficiency toward the front direction, we could use those nanoporous polymer films as scattering media or diffuser layer on top of the encapsulation glass because it could change the strongly directed emission toward desired emission with Lambertian distribution.

Original language	English
Pages (from-to)	57-62
Number of pages	6
Journal	Synthetic Metals
Volume	189
DOIs	https://doi.org/10.1016/j.synthmet.2013.12.020
Publication status	Published - Mar 2014

Bibliographical note

Funding Information:
This work was supported by the Industrial Strategic Technology Development Program (No. 10041062) funded by the Ministry of Knowledge Economy (MKE, Korea) and the National Research Foundation of Korea (NRF) (Grant No. NRF-2011-0006847). This work was also supported by the Human Resources Development Program (No. 20134010200490) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Trade, Industry and Energy . The authors are grateful to Mr. Kyung Nam Kang and Prof. Jungho Kim for helpful discussion and collaboration to investigate the viewing angle dependency of the devices.

Keywords

Color saturation
Microcavity effect
Scattering media
Top emission
View angle dependency

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10.1016/j.synthmet.2013.12.020

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title = "Top-emission organic light emitting diodes with lower viewing angle dependence",

abstract = "We obtained nanoporous polymer film which has 20-30% optical haze to suppress the viewing angle dependency of a top emission organic light emitting diode (TOLED) with strong microcavity effect. We controlled the sizes and density of nanopores by changing the spin coating condition such as spinning duration and spin rate in highly humid atmosphere up to 90% relative humidity condition. The resultant nanoporous polymer film has effectively reduced viewing angle dependency of microcavity TOLEDs without any serious decrease in total intensity of out-coupled light observed from the integrating sphere although the luminance observed from the front side was diminished slightly. Despite its negative effect on the efficiency toward the front direction, we could use those nanoporous polymer films as scattering media or diffuser layer on top of the encapsulation glass because it could change the strongly directed emission toward desired emission with Lambertian distribution.",

keywords = "Color saturation, Microcavity effect, Scattering media, Top emission, View angle dependency",

author = "Lim, {Byung Wan} and Jeon, {Hyeon Soo} and Suh, {Min Chul}",

note = "Funding Information: This work was supported by the Industrial Strategic Technology Development Program (No. 10041062) funded by the Ministry of Knowledge Economy (MKE, Korea) and the National Research Foundation of Korea (NRF) (Grant No. NRF-2011-0006847). This work was also supported by the Human Resources Development Program (No. 20134010200490) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Trade, Industry and Energy . The authors are grateful to Mr. Kyung Nam Kang and Prof. Jungho Kim for helpful discussion and collaboration to investigate the viewing angle dependency of the devices.",

year = "2014",

month = mar,

doi = "10.1016/j.synthmet.2013.12.020",

language = "English",

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journal = "Synthetic Metals",

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T1 - Top-emission organic light emitting diodes with lower viewing angle dependence

AU - Lim, Byung Wan

AU - Jeon, Hyeon Soo

AU - Suh, Min Chul

N1 - Funding Information: This work was supported by the Industrial Strategic Technology Development Program (No. 10041062) funded by the Ministry of Knowledge Economy (MKE, Korea) and the National Research Foundation of Korea (NRF) (Grant No. NRF-2011-0006847). This work was also supported by the Human Resources Development Program (No. 20134010200490) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Trade, Industry and Energy . The authors are grateful to Mr. Kyung Nam Kang and Prof. Jungho Kim for helpful discussion and collaboration to investigate the viewing angle dependency of the devices.

PY - 2014/3

Y1 - 2014/3

N2 - We obtained nanoporous polymer film which has 20-30% optical haze to suppress the viewing angle dependency of a top emission organic light emitting diode (TOLED) with strong microcavity effect. We controlled the sizes and density of nanopores by changing the spin coating condition such as spinning duration and spin rate in highly humid atmosphere up to 90% relative humidity condition. The resultant nanoporous polymer film has effectively reduced viewing angle dependency of microcavity TOLEDs without any serious decrease in total intensity of out-coupled light observed from the integrating sphere although the luminance observed from the front side was diminished slightly. Despite its negative effect on the efficiency toward the front direction, we could use those nanoporous polymer films as scattering media or diffuser layer on top of the encapsulation glass because it could change the strongly directed emission toward desired emission with Lambertian distribution.

AB - We obtained nanoporous polymer film which has 20-30% optical haze to suppress the viewing angle dependency of a top emission organic light emitting diode (TOLED) with strong microcavity effect. We controlled the sizes and density of nanopores by changing the spin coating condition such as spinning duration and spin rate in highly humid atmosphere up to 90% relative humidity condition. The resultant nanoporous polymer film has effectively reduced viewing angle dependency of microcavity TOLEDs without any serious decrease in total intensity of out-coupled light observed from the integrating sphere although the luminance observed from the front side was diminished slightly. Despite its negative effect on the efficiency toward the front direction, we could use those nanoporous polymer films as scattering media or diffuser layer on top of the encapsulation glass because it could change the strongly directed emission toward desired emission with Lambertian distribution.

KW - Color saturation

KW - Microcavity effect

KW - Scattering media

KW - Top emission

KW - View angle dependency

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DO - 10.1016/j.synthmet.2013.12.020

M3 - Article

AN - SCOPUS:84892990842

SN - 0379-6779

VL - 189

SP - 57

EP - 62

JO - Synthetic Metals

JF - Synthetic Metals

ER -

Top-emission organic light emitting diodes with lower viewing angle dependence

Abstract

Bibliographical note

Keywords

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