Color-saturated and highly efficient top-emitting organic light-emitting devices

Hsu, Shun-Chieh; Lee, Chung‐Chun; Hwang, Shiao‐Wen; Chen, Hsian-Hung; Chen, Chin H.; Hu, Andrew Teh

doi:10.1016/j.tsf.2004.10.038

Cited by 46 publications

(27 citation statements)

References 17 publications

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“…3-5). This shift is thought to originate from the so-called microcavity effect [10], that is BAlq and ITO films work as microcavities. The wavelength of the light confined in the microcavity depends on the thickness of the ITO films, so that the peak shift in the PL spectra occurs due to the deposition of ITO film.…”

Section: Resultsmentioning

confidence: 99%

Low Damage Sputter Deposition of ITO Films on Organic Light Emitting Films

Lei

Ichikawa

Hoshi

et al. 2009

Trans. Mat. Res. Soc. Japan

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Damage to an aluminum (III) bis(2-methyl-8-quninolinato)-4-phenylphenolate (BAlq) layer was investigated during indium-tin oxide (ITO) deposition using a facing target sputtering (FTS) system in which the bombardment of negative oxygen ions and -electrons onto the substrate can be completely suppressed. The photoluminescence (PL) intensity of BAlq was used to evaluate the damage on the organic layer after the deposition of an ITO thin film in Ar and Kr gas at different gas pressures and input power levels. The results suggest that the bombardment of reflected neutral atoms is not the main reason for the damage. The remnant damage from the bombardment of sputtered atoms can be reduced by sputtering at a higher gas pressure. Finally, the bombardment of the organic film by high-energy particles such as negative oxygen ions, -electrons, and sputter-emitted atoms was completely suppressed using an FTS system to attain low-damage and high-rate sputter ITO deposition.

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Section: Resultsmentioning

confidence: 99%

Low Damage Sputter Deposition of ITO Films on Organic Light Emitting Films

Lei

Ichikawa

Hoshi

et al. 2009

Trans. Mat. Res. Soc. Japan

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“…As a result, the AR of TEOLEDs can be greatly increased and the operating voltage is reduced for a given luminance, which could ultimately result in longer operational lifetime of devices. [ 11 ] Similar to TEOLEDs, the so-called "inverted OLEDs" are also classifi ed as surface-or top-emission structures. The only structural difference is that inverted OLEDs use the refl ective bottom electrode as the cathode and the top (semi-)transparent anode is the side where light escapes.…”

Section: Teoleds With Different Emission Colorsmentioning

confidence: 99%

“…Han [ 71 ] and Cao [ 46 ] reported an Alq 3 -based adjustable color emission from bluish green to red (500 to 680 nm) by merely changing the ITO fi lm thickness between the two refl ective layers. Using the same method, Hsu [ 11 ] and Cao [ 46 ] also accurately calculated the cavity lengths corresponding to FWHM is much stronger than that of the effective cavity,…”

Section: Red and Green Teoledsmentioning

confidence: 99%

Recent Developments in Top‐Emitting Organic Light‐Emitting Diodes

et al. 2010

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Organic light-emitting diodes (OLEDs) have rapidly progressed in recent years due to their unique characteristics and potential applications in flat panel displays. Significant advancements in top-emitting OLEDs have driven the development of large-size screens and microdisplays with high resolution and large aperture ratio. After a brief introduction to the architecture and types of top-emitting OLEDs, the microcavity theory typically used in top-emitting OLEDs is described in detail here. Then, methods for producing and understanding monochromatic (red, green, and blue) and white top-emitting OLEDs are summarized and discussed. Finally, the status of display development based on top-emitting OLEDs is briefly addressed.

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“…Coumarin constitute the largest class of laser dyes in the 'blue-green' region [21][22][23][24][25]. Coumarin dyes have also been used as blue, green and red dopants in organic light-emitting diodes (OLEDs) [26][27][28], in dye-sensitized solar cells (DSSC) [29][30][31] and tailored to in vivo imaging applications [32][33][34][35]. In recent years Wang and co-workers report AIE active coumarin-based Schiff bases and successively put into applications in cell imaging [36].…”

Section: Introductionmentioning

confidence: 99%

AIE Based Coumarin Chromophore - Evaluation and Correlation Between Solvatochromism and Solvent Polarity Parameters

Lanke

Sekar

2015

J Fluoresc

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A new class of red emitting extensively conjugated donor-π-acceptor type dyes bearing coumarin units have been synthesized by condensation of 7-(diethylamino)-2-oxo-2 H-chromene-3-carbaldehyde with different active methylenes. All the dyes are characterized by (1)H NMR, (13)C NMR and HRMS spectroscopy. The photophysical behaviour and the relation between structure and properties of the coumarin "push-pull" derivatives were investigated experimentally. The dyes exhibited positive solvatochromism and solvatofluorism in solution of varying polarity. These coumarin dyes show aggregation induced emission properties with red emitting fluorescence. They show absorption in the range of 501-528 and emission in the range of 547-630 nm. We evaluated photophysical properties of coumarin dyes using solvotochromism and solvent dependent shift in the emission wavelength. All the synthesized coumarin dyes COS1-COS4 are showing very good solvatochromic properties.

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Color-saturated and highly efficient top-emitting organic light-emitting devices

Cited by 46 publications

References 17 publications

Low Damage Sputter Deposition of ITO Films on Organic Light Emitting Films

Low Damage Sputter Deposition of ITO Films on Organic Light Emitting Films

Recent Developments in Top‐Emitting Organic Light‐Emitting Diodes

AIE Based Coumarin Chromophore - Evaluation and Correlation Between Solvatochromism and Solvent Polarity Parameters

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