Disruptive characteristics and lifetime issues of OLEDs

Jou, Jwo‐Huei; Kumar, Sudhir; Jou, Yung-Cheng

doi:10.1533/9780857098948.2.410

Cited by 6 publications

(2 citation statements)

References 110 publications

(151 reference statements)

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“…In recent years, both academics and industries have made several efforts to enhance the operational stability of OLEDs (for a review of operational stability enhancement, see our book chapter [101]). Researchers have reported several approaches for long lifetime devices—for example, design and synthesis of high thermally and electrically stable organic materials, mixed host device architecture, and electrode interfaces (e.g., ITO/HTL or ETL/Al) modifications [101]. Besides these approaches, a nano CML as exciton blocking layer and buffer layer also markedly enhance the operational stability of OLEDs.…”

Section: Effect Of CML On Lifetimementioning

confidence: 99%

Carrier Modulation Layer-Enhanced Organic Light-Emitting Diodes

et al. 2015

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Organic light-emitting diode (OLED)-based display products have already emerged in the market and their efficiencies and lifetimes are sound at the comparatively low required luminance. To realize OLED for lighting application sooner, higher light quality and better power efficiency at elevated luminance are still demanded. This review reveals the advantages of incorporating a nano-scale carrier modulation layer (CML), also known as a spacer, carrier-regulating layer, or interlayer, among other terms, to tune the chromaticity and color temperature as well as to markedly improve the device efficiency and color rendering index (CRI) for numerous OLED devices. The functions of the CML can be enhanced as multiple layers and blend structures are employed. At proper thickness, the employment of CML enables the device to balance the distribution of carriers in the two emissive zones and achieve high device efficiencies and long operational lifetime while maintaining very high CRI. Moreover, we have also reviewed the effect of using CML on the most significant characteristics of OLEDs, namely: efficiency, luminance, life-time, CRI, SRI, chromaticity, and the color temperature, and see how the thickness tuning and selection of proper CML are crucial to effectively control the OLED device performance.

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Section: Effect Of CML On Lifetimementioning

confidence: 99%

Carrier Modulation Layer-Enhanced Organic Light-Emitting Diodes

et al. 2015

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“…Most white OLEDs for lighting contain three emitters: red, green, and blue (RGB), in either two‐stack (RG,B) or three‐stack (R,G,B) architectures. Over the years, our group fabricated a number of warm white OLEDs with two‐ or three‐emitter systems 18–22 . However, even with three broad emitters, there can still be a sizable gap in the resulting spectrum.…”

Section: Oleds With Candle‐like Emissionmentioning

confidence: 99%

OLEDs with Candle‐Like Emission

Jou¹,

Singh²,

Tsai³

et al. 2015

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Light Harvesting Materials: A Study on Förster Resonance Energy Transfer and Optoelectronic Properties of Potential Nerium oleander Flowers

Harshitha.,

Kumar,

Renuka

2024

Luminescence

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The present study focused on extracting the anthocyanin dyes in ethanol, acidic ethanol, methanol, and acidic methanol solvents from Nerium oleander flowers by a simple maceration extraction process. FTIR spectroscopy and vibrational studies have confirmed the existence of polyphenolic groups in 2‐phenyl chromenylium (anthocyanin) dyes. The optoelectronic results show the least direct bandgap (2.89 eV), indirect bandgap (1.98 eV), Urbach energy (0.120 eV), high refractive index (1.654), dielectric constant (3.294) and high optical conductivity (1.813 103 S/m) for the anthocyanin dye extracted found in acidic ethanol solvent. The photoluminescence properties such as Stokes' shift, quantum yield, and lifetime results show that anthocyanin dyes are promising candidates for red‐LEDs and optical materials. The excellent correspondence between the absorption and emission spectra reinforces that the anthocyanins are efficient (89%) FRET probes. Further, the donor and acceptor undergo redshift in excitation and emission spectra in all studied solvents. The photometric properties such as CIE, CRI, CCT and color purity results of anthocyanins in all studied solvents revealed that this material exhibits pink to red shades (x = 0.40 → 0.50 and y = 0.46 → 0.39) and is well suitable for have great potential in the manufacturing of Organic‐LEDs and other optoelectronic device applications.

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Disruptive characteristics and lifetime issues of OLEDs

Cited by 6 publications

References 110 publications

Carrier Modulation Layer-Enhanced Organic Light-Emitting Diodes

Carrier Modulation Layer-Enhanced Organic Light-Emitting Diodes

OLEDs with Candle‐Like Emission

Light Harvesting Materials: A Study on Förster Resonance Energy Transfer and Optoelectronic Properties of Potential Nerium oleander Flowers

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