High contrast blue organic light-emitting diodes using inorganic multilayers of Al and ZnSe

You-Hyun Kim; Sang Youn Lee; Wook Song; Mei Meng; Richard Wood; Peter Mascher; Dae Hyun Ryu; Woo Young Kim

doi:10.1364/OL.37.005235

Optics Letters
Vol. 37,
Issue 24,
pp. 5235-5237
(2012)
•https://doi.org/10.1364/OL.37.005235

High contrast blue organic light-emitting diodes using inorganic multilayers of Al and ZnSe

You-Hyun Kim, Sang Youn Lee, Wook Song, Mei Meng, Richard Wood, Peter Mascher, Dae Hyun Ryu, and Woo Young Kim

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You-Hyun Kim, Sang Youn Lee, Wook Song, Mei Meng, Richard Wood, Peter Mascher, Dae Hyun Ryu, and Woo Young Kim, "High contrast blue organic light-emitting diodes using inorganic multilayers of Al and ZnSe," Opt. Lett. 37, 5235-5237 (2012)

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Abstract

High contrast blue organic light-emitting diodes were fabricated using an inorganic multilayer of NPB (700 Å)/MADN (200 Å)/ ${Alq}_{3}$ (300 Å)/LiF (10 Å)/Al (70 Å)/ZnSe (300 Å)/Al (1000 Å). The optical and electrical characteristics were measured and compared to conventional organic light-emitting devices (OLEDs) and OLEDs with polarizers. OLEDs with the metal multilayer cathodes had an improved contrast ratio of $135 ∶ 1$ compared to $104 ∶ 1$ for OLEDs with polarizers. In addition, the multilayer OLEDs had a low turn-on voltage of 3.5 V due to energy band fitting of ZnSe with Al and the electron transport layer.

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	Device Structures
Device A	NPB (700 Å)/MADN (200 Å)/ ${Alq}_{3}$ (300 Å)/LiF (10 Å)/Al (90 Å)/ZnSe (200 Å)/Al (1000 Å)
Device B	NPB (700 Å)/MADN (200 Å)/ ${Alq}_{3}$ (300 Å)/LiF (10 Å)/Al (90 Å)/KCl (300 Å)/Al (1000 Å)
Device C	Polarizer/NPB (700 Å)/MADN (200 Å)/ ${Alq}_{3}$ (300 Å)/LiF (10 Å)/Al (1000 Å)
Device D	NPB (700 Å)/MADN (200 Å)/ ${Alq}_{3}$ (300 Å)/LiF (10 Å)/Al (1000 Å)

	Reflectance (%)	Ambient Light Reflectance ( $cd / m^{2}$ )	Max. Luminance ( $cd / m^{2}$ )	Contrast Ratio
Device A	24.0	35.2	4678	$135 ∶ 1$
Device B	29.0	42.5	4707	$112 ∶ 1$
Device C	25.8	37.8	3897	$104 ∶ 1$
Device D	83.5	122.5	8456	$70 ∶ 1$

	Device Structures
Device A	NPB (700 Å)/MADN (200 Å)/ ${Alq}_{3}$ (300 Å)/LiF (10 Å)/Al (90 Å)/ZnSe (200 Å)/Al (1000 Å)
Device B	NPB (700 Å)/MADN (200 Å)/ ${Alq}_{3}$ (300 Å)/LiF (10 Å)/Al (90 Å)/KCl (300 Å)/Al (1000 Å)
Device C	Polarizer/NPB (700 Å)/MADN (200 Å)/ ${Alq}_{3}$ (300 Å)/LiF (10 Å)/Al (1000 Å)
Device D	NPB (700 Å)/MADN (200 Å)/ ${Alq}_{3}$ (300 Å)/LiF (10 Å)/Al (1000 Å)

	Reflectance (%)	Ambient Light Reflectance ( $cd / m^{2}$ )	Max. Luminance ( $cd / m^{2}$ )	Contrast Ratio
Device A	24.0	35.2	4678	$135 ∶ 1$
Device B	29.0	42.5	4707	$112 ∶ 1$
Device C	25.8	37.8	3897	$104 ∶ 1$
Device D	83.5	122.5	8456	$70 ∶ 1$

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Optics Letters