Improving the brightness and daylight contrast of organic light-emitting diodes

V. Vaenkatesan, R.T. Wegh, J.P. Teunissen, Johan Lub, C.W.M. Bastiaansen, D.J. Broer

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Abstract

For most applications of displays based on org. light-emitting diodes (LEDs), it is desirable to have good daylight contrast in combination with a high intensity of emitted light. The conventional approaches to enhance the daylight contrast, using a black cathode or circular polarizers, result in a significant loss of light emitted by the LED. A rather novel approach to enhance daylight contrast while keeping loss of emitted light to a min. is the introduction of a chiral-nematic film in the device. This approach leads to an increase in light efficiency by a factor of 1.8 (with respect to circular polarizers) with some loss in daylight contrast values within the reflection band of the chiral-nematic film. Outside the reflection band, however, the contrast approaches infinity
Original languageEnglish
Pages (from-to)138-142
Number of pages5
JournalAdvanced Functional Materials
Volume15
Issue number1
DOIs
Publication statusPublished - 2005

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Organic light emitting diodes (OLED)
Luminance
brightness
light emitting diodes
Light emitting diodes
polarizers
Cathodes
infinity
Display devices
cathodes

Cite this

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abstract = "For most applications of displays based on org. light-emitting diodes (LEDs), it is desirable to have good daylight contrast in combination with a high intensity of emitted light. The conventional approaches to enhance the daylight contrast, using a black cathode or circular polarizers, result in a significant loss of light emitted by the LED. A rather novel approach to enhance daylight contrast while keeping loss of emitted light to a min. is the introduction of a chiral-nematic film in the device. This approach leads to an increase in light efficiency by a factor of 1.8 (with respect to circular polarizers) with some loss in daylight contrast values within the reflection band of the chiral-nematic film. Outside the reflection band, however, the contrast approaches infinity",
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Improving the brightness and daylight contrast of organic light-emitting diodes. / Vaenkatesan, V.; Wegh, R.T.; Teunissen, J.P.; Lub, Johan; Bastiaansen, C.W.M.; Broer, D.J.

In: Advanced Functional Materials, Vol. 15, No. 1, 2005, p. 138-142.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Improving the brightness and daylight contrast of organic light-emitting diodes

AU - Vaenkatesan, V.

AU - Wegh, R.T.

AU - Teunissen, J.P.

AU - Lub, Johan

AU - Bastiaansen, C.W.M.

AU - Broer, D.J.

PY - 2005

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JO - Advanced Functional Materials

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