Reliability and degradation of small molecule-based organic light-emitting devices (OLEDs)

Popović, Zoran D.; Aziz, Hany

doi:10.1109/2944.999191

Cited by 137 publications

(86 citation statements)

References 60 publications

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“…Although other degradation mechanisms can play roles during the lifetime test, charge redistribution and accumulation phenomenon can be considered to commonly occur in the course of the degradation process for typical multilayer OLEDs, sometimes depending on stages during the whole lifetime span [19]. In fact, similar frequency dependent JOLED-VOLED shifts were also observed for other multi-layer red and green OLEDs in our previous study [20].…”

Section: Resultssupporting

confidence: 59%

Frequency Dependency of Multi-layer OLED Current Density-voltage Shift and Its Application to Digitally-driven AMOLED

Kim¹,

Kim²,

Hong³

2012

Journal of the Optical Society of Korea

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We report, for the first time, operation frequency dependence of current density-voltage (JOLED-VOLED) shift for multi-layer organic light-emitting diodes (OLEDs). When the OLEDs were electrically stressed for 21 hours with 50% duty voltage pulses at 60, 120, 240, and 360 Hz, the JOLED-VOLED shifts were suppressed by half for 360 Hz operation compared with 60 Hz operation, but with little change in emission efficiencies. This frequency dependent JOLED-VOLED shift is believed to be commonly observed for typical multi-layer OLEDs and can be used to further improve lifetime of digitally-driven active-matrix OLED displays.

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Section: Resultssupporting

confidence: 59%

Frequency Dependency of Multi-layer OLED Current Density-voltage Shift and Its Application to Digitally-driven AMOLED

Kim¹,

Kim²,

Hong³

2012

Journal of the Optical Society of Korea

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“…In the past, tris(8-hydroxyquinoline)aluminum (Alq 3 ), a-NPD, and rubrene have been demonstrated to be stable and efficient yellow OLED materials. [16] In bipolartransport-layer [17] and graded-mixed-layer [8] OLEDs, both the electron-transport material (Alq 3 ) and the hole-transport material (NPD) have been used as the hosts. Hence, we selected NPD and rubrene as the starting materials for the FOSS in this study.…”

Section: Formation and Characterization Of Fused Organic Solid Solutionsmentioning

confidence: 99%

Organic Solid Solutions: Formation and Applications in Organic Light‐Emitting Diodes

Shao

Yang

2005

Adv Funct Materials

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To enhance the performance of organic devices, doping and graded mixed‐layer structures, formed by co‐evaporation methods, have been extensively adopted in the formation of organic thin films. Among the criteria for selecting materials systems, much attention has been paid to the materials' energy‐band structure and carrier‐transport behavior. As a result, some other important characteristics may have been overlooked, such as material compatibility or solubility. In this paper, we propose a new doping method utilizing fused organic solid solutions (FOSSs) which are prepared via high‐pressure and high‐temperature processing. By preparing fused solid solutions of organic compounds, the stable materials systems can be selected for device fabrication. Furthermore, by using these FOSSs, doping concentration and uniformity can be precisely controlled using only one thermal source. As an example of application in organic thin films, high‐performance organic light‐emitting diodes with both single‐color and white‐light emission have been prepared using this new method. Compared to the traditional co‐evaporation method, a FOSS provides us with a more convenient way to optimize the doping system and fabricate relatively complicated organic devices.

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“…Devices in operation are subject to a decrease in luminescence over time with the associated formation of dark spots. This degradation continues until the device fails [2,3]. Studies have shown that substitution with electron withdrawing or donating substituents can alter the rate of degradation of electroluminescent polymers [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Kinetic studies of the photo-degradation of poly(arylene vinylenes)

O’Neill¹,

Lynch²,

McGoldrick

et al. 2012

Journal of Luminescence

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThe kinetics of the degradation of a homologous series of Poly phenylene vinylenes in which the phenylene units of the PPV structure are systematically substituted by naphthyl and anthyrl units is presented. Degradation is monitored according to the decay of the long wavelength absorption maximum upon illumination with UV radiation. Compared to Toluene solution, the photo-degradation is seen to be accelerated in Chloroform solution. All decays are fitted with first order kinetics. It is found that all substitutions improve the stability of the vinylene polymers against decay.In particular the highly electro-negative naphthyl group serves to drastically increase the stability due to electron depletion across the vinyl bond. The decay rate is shown to correlate well with the variation of the electronic properties of the backbone and with the reduction of vinylene bond strength as measured using Raman spectroscopy.

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Reliability and degradation of small molecule-based organic light-emitting devices (OLEDs)

Cited by 137 publications

References 60 publications

Frequency Dependency of Multi-layer OLED Current Density-voltage Shift and Its Application to Digitally-driven AMOLED

Frequency Dependency of Multi-layer OLED Current Density-voltage Shift and Its Application to Digitally-driven AMOLED

Organic Solid Solutions: Formation and Applications in Organic Light‐Emitting Diodes

Kinetic studies of the photo-degradation of poly(arylene vinylenes)

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