Degradation Mechanism of Small Molecule-Based Organic Light-Emitting Devices

Aziz, Hany; Popović, Zoran D.; Hu, Nan-Xing; Hor, Ah‐Mee; Xu, Gu

doi:10.1126/science.283.5409.1900

Cited by 805 publications

(414 citation statements)

References 15 publications

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“…[15][16][17] Moreover, it is possible for us to use simple wet-process fabricating means due to its simplest architecture. Recently, we have investigated 5,6,11,12-tetraphenylnaph-thacene (rubrene) based small molecular mixed single layer OLEDs by vacuum processing method.…”

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confidence: 99%

Highly simplified small molecular phosphorescent organic light emitting devices with a solution-processed single layer

et al. 2011

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A highly simplified single layer solution-processed phosphorescent organic light emitting device (PHOLED) with the maximum ηP 11.5 lm/W corresponding to EQE 9.6% has been demonstrated. The solution-processed device is shown having comparable even exceeding device performance to vacuum-processed PHOLED. The simplified device design strategy represents a pathway toward large area, low cost and high efficiency OLEDs in the future. The charge injection and conduction mechanisms in two solution- and vacuum-processed devices are also investigated by evaluating the temperature dependence of current density – voltage characteristics

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confidence: 99%

Highly simplified small molecular phosphorescent organic light emitting devices with a solution-processed single layer

et al. 2011

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“…There are a number of arguing causes of luminosity degradation. Among them, commonly recognized causes of luminosity degradation are [1], [34]:…”

Section: Motivated Example: Adt Of the Oledmentioning

confidence: 99%

“…4, all the luminosity of the OLED tend to decrease rapidly at the initial stage of degradation testing, then its degradation becomes more gradual. To capture the characteristics of OLED degradation, we introduce the bi-exponential model (1) to relative luminosity data. The testing data also suggest that the OLED degradation model should include variability among and within individual units, which can be efficiently modeled by introducing random-coefficients.…”

Section: B Oled Example 1) Accelerated Degradation Testing Of Oledmentioning

confidence: 99%

Direct Prediction Methods on Lifetime Distribution of Organic Light-Emitting Diodes From Accelerated Degradation Tests

2010

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Abstract-Accelerated degradation testing (ADT) expedites product degradation by stressing the product beyond its normal use. To extrapolate the product's reliability at use condition, the ADT requires a known functional link relating the harsh testing environment to the usual use environment. Practitioners are often faced with a great challenge to designate an explicit form of the stress-degradation relationship a priori in accelerated degradation models. In this paper, we propose three methods to make direct inference on the lifetime distribution itself without invoking arbitrary assumptions on the degradation model: delta approximation, multiple imputation of failure-times, and the lifetime distribution-based (LDB) method. The methods are easy to implement without computational difficulty, hence they have potential in a wide range of applications for estimating lifetime distributions from ADT data. We applied the methods to two ADT data sets including a real application of commercial organic light-emitting diodes (OLED). The analysis of the examples and simulation results suggests parametric LDB and multiple imputation method as more potential alternatives to traditional failure-time approaches, especially for the case where there is neither enough physical background, nor historical evidence supporting presumed relationships between stress and the parameters of the degradation model.

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“…In the last decade, the problem of OLED stability and long-term degradation is in the focus of organic semiconductor researches [1][2][3], since the operational stability of the current generation of such devices is limited by chemical reactions of the molecular components of devices. Recently, varioius approaches to the stabilization of OLEDs such as the doping of a hole transport layer, introducing a buffer layer at the hole-injecting contact, and using mixed emitting layers of hole-and electron-transporting molecules were applied [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Optical Properties and Stability of Bilayer Rubrene-Alq3 Films Fabricated by Vacuum Deposition

et al. 2018

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We report on the optical and structural characterization of the two-component vacuum deposited (VD) rubrene (Rub)-Alq3 films. As is known, Rub-doped OLED active materials demonstrate both promising electroluminescence and transistor characteristics. However, in terms of operational lifetime, the Rub practical application in basic devices has a few drawbacks related to its chemical instability. Our main attention was focused on the role of the Alq3 coverage and the isomeric transformation of a Rub molecule on its chemical stability in these structures. By monitoring the evolution of PL emission in time, we found that the Rub degradation in Rub-Alq3 films is slower than that in vacuum-deposited Rub layers. These results demonstrate that the deposition of an Alq3 layer can be a way to enhance the stability of Rub to the photo-oxidation in optoelectronic devices. The Rub amorphous film crystallization at elevated temperatures in open air was observed for the first time.K e y w o r d s: rubrene, Alq3, oxidized rubrene, vacuum deposition, thin films, FTIR spectra, photoluminescence.

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Degradation Mechanism of Small Molecule-Based Organic Light-Emitting Devices

Cited by 805 publications

References 15 publications

Highly simplified small molecular phosphorescent organic light emitting devices with a solution-processed single layer

Highly simplified small molecular phosphorescent organic light emitting devices with a solution-processed single layer

Direct Prediction Methods on Lifetime Distribution of Organic Light-Emitting Diodes From Accelerated Degradation Tests

Optical Properties and Stability of Bilayer Rubrene-Alq3 Films Fabricated by Vacuum Deposition

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