A Study on Thermal Degradation of Organic LEDs Using IR Imaging

Nenna, Giuseppe; Flaminio, G.; Fasolino, T.; Minarini, Carla; Miscioscia, Riccardo; Palumbo, Davide; Pellegrino, M

doi:10.1002/masy.200750137

Cited by 31 publications

(30 citation statements)

References 11 publications

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“…As stated before, the temperature rise may occur from outside the device or due to the Joule heating, across the entire area, 15,42,328 or even at localized defects. 132,136,218 Most experiments that have been performed to investigate this subject are based on morphology-change measurements on single layer films and not on fully processed devices. The larger part of these experiments focuses on the crystallization behavior of the materials due to temperature rise.…”

Section: Temperature Effectsmentioning

confidence: 99%

Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

et al. 2015

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Section: Temperature Effectsmentioning

confidence: 99%

Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

et al. 2015

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“…In addition, the neighbor's signal decays to half its edge value over 50μm, or nearly 30% of the pixel length. Figure 3 strongly suggests that pixel operation affects the lifetime of the nearest neighbor pixels even when they are unbiased, because elevated temperature accelerates degradation in OLEDs [1], [2].…”

Section: B Heat Diffusion and Thermal Crosstalkmentioning

confidence: 97%

“…High temperatures accelerate degradation in OLEDs [1], [2], can cause thermal runaway [3], and can also lead to surface instabilities in the organic layers [4]. The problem of thermal management is exacerbated in devices with flexible or transparent substrates, which have poor thermal conductivity, as well as in high-power devices or large-area displays [5], [6].…”

Section: Introductionmentioning

confidence: 97%

Mapping Temperature in OLED Displays Using CCD Thermoreflectance

Katz

Arango

Hudgings

2014

IEEE Photon. Technol. Lett.

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Effective thermal management is essential to engineering organic devices, since heating accelerates their degradation. However, as pixels in organic light-emitting diode (OLED) displays continue to shrink, an important tool for thermal management, infrared thermography, approaches the limits of its spatial resolution. To address this problem, we adapt highresolution thermoreflectance imaging, which measures minute changes in reflectivity of visible light, to map temperature in a commercial OLED display. We identify a slowly varying thermal signal and find strong evidence of thermal crosstalk, in which a biased pixel heats up its nearest neighbors, even when the neighbors are unbiased. Such crosstalk is indicative of insufficient heat dissipation, which can lead to reduced display lifetime.Index Terms-Thermal management of electronics, photothermal effects, organic light emitting diodes, displays.

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“…Examples include monitoring the evolution of temperature in chemical reactors [1], detection of "hot spots" in microelectronic devices [2], detection of local temperatures within integrated photonic devices to prevent irreversible damages [3], monitoring heat dissipation during optical trapping [4], monitor temperature changes in microfluidic systems [5] and monitoring metabolic processes in living organisms [6], to name a few.…”

Section: Introductionmentioning

confidence: 99%

New strategies invonving upconverting nanoparticles for determining moderate temperatures by luminescence thermometry

Savchuk

Carvajal

Pujol

et al. 2016

Journal of Luminescence

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Here we analyze alternative luminescence thermometry techniques to FIR, such as intensity ratio luminescence thermometry between the emission arising from two electronic levels that are not necessarily thermally coupled, but that show different evolutions with temperature, and lifetime luminescence nanothermometry in (Ho,Tm,Yb):KLu(WO 4 ) 2 and (Er,Yb):NaY 2 F 5 O nanoparticles. (Ho,Tm,Yb):KLu(WO 4 ) 2 nanoparticles exhibited a maximum relative sensitivity of 0.61 % K -1 , similar to that achievable in Er-doped systems, which are the upconverting systems presenting the highest sensitivity. From another side, (Er,Yb):NaY 2 F 5 O nanocrystals show great potentiality as thermal sensors at the nanoscale for moderate temperatures due to the incorporation of additional non-radiative relaxation mechanisms that shorten the emission lifetime generated by the oxygen present in the structure when compared to (Er,Yb):NaYF 4 nanoparticles exhibiting the highest upconversion efficiency. We used those nanoparticlesfor ex-vivo temperature determination by laser induced heating in chicken breast using lifetime-based thermometry. The results obtained indicate that these techniques might constitute alternatives to FIR with potential applications for the determination of moderate temperatures, with sensitivities comparable to those that can be achieved by FIR or even higher.

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A Study on Thermal Degradation of Organic LEDs Using IR Imaging

Cited by 31 publications

References 11 publications

Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

Degradation Mechanisms and Reactions in Organic Light-Emitting Devices

Mapping Temperature in OLED Displays Using CCD Thermoreflectance

New strategies invonving upconverting nanoparticles for determining moderate temperatures by luminescence thermometry

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