Materials depth distribution and degradation of a FIrpic based solution-processed blue OLED

Jeltsch, Krischan F.; Lupa, G.; Weitz, R. Thomas

doi:10.1016/j.orgel.2015.08.003

Cited by 17 publications

(15 citation statements)

References 18 publications

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“…Moreover, a minor change in the driving voltage was obtained even for a high luminance of 5000 cd m −2 (Fig. 5a ), thus protecting our device from Joule heating and subsequent degradation 45 . The shape of the degraded EL spectra was in all cases similar to the initial ones (Fig.…”

Section: Resultsmentioning

confidence: 85%

High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence

et al. 2021

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Blue organic light-emitting diodes require high triplet interlayer materials, which induce large energetic barriers at the interfaces resulting in high device voltages and reduced efficiencies. Here, we alleviate this issue by designing a low triplet energy hole transporting interlayer with high mobility, combined with an interface exciplex that confines excitons at the emissive layer/electron transporting material interface. As a result, blue thermally activated delay fluorescent organic light-emitting diodes with a below-bandgap turn-on voltage of 2.5 V and an external quantum efficiency (EQE) of 41.2% were successfully fabricated. These devices also showed suppressed efficiency roll-off maintaining an EQE of 34.8% at 1000 cd m−2. Our approach paves the way for further progress through exploring alternative device engineering approaches instead of only focusing on the demanding synthesis of organic compounds with complex structures.

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Section: Resultsmentioning

confidence: 85%

High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence

et al. 2021

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“…In developing solution‐processable small‐molecule OLED materials, research has tended to have an insular outlook, with the vast majority of work reported to date focusing primarily on improving device efficiency. In contrast, only very few reports have addressed the limited stability issue of these devices . Furthermore, the focus of those studies has primarily been limited to investigating the chemical stability of the materials.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Lin et al identified a relationship between the excited state energy and the intrinsic chemical stability of some OLED molecules . Jeltsch et al used time of flight secondary ion mass spectrometry to study degradation byproducts in solution‐processed multilayer organic stacks as a function of depth . Using photophysical measurements, Choi et al demonstrated that 4,4′‐bis( N ‐carbazolyl)biphenyl (CBP) degraded in solutions as a result of photochemical and photocatalytic reactions .…”

Section: Introductionmentioning

confidence: 99%

The Root Causes of the Limited Stability of Solution‐Coated Small‐Molecule Organic Light‐Emitting Devices: Faster Host Aggregation by Exciton–Polaron Interactions

Cho

Zhang

et al. 2016

Adv Funct Materials

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The degradation mechanism is compared in organic light-emitting devices (OLEDs) fabricated by solution-coating to that in vacuum-deposited OLEDs. Devices comprising various host materials made by vacuum-deposition or solution-coating are investigated. Changes in devices electroluminescence (EL) spectra during prolonged electrical driving are compared and analyzed. Hole-only devices are also utilized, and employed to study the effects of charges and excitons, separately and combined. The results reveal that the faster degradation of solution-processed devices relative to their vacuumdeposited counterparts under electrical stress is due to a faster aggregation of the host materials. Interactions between excitons and polarons in the emitting layers of the devices induce this aggregation phenomenon. Although this phenomenon affects both vacuum-deposited and solution-coated emitting layers, it is found to occur much faster in the later. The findings shed light on the root causes of the limited stability of solution-processed OLEDs.

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“…S7b, ESI †). This is in contrast to the reported accumulation of FIrpic at the PEDOT:PSS/EML interface 36 and is evidence of the ability of the dendrimeric Ir(DTri) 3 to provide the processability needed to form good quality uniform thin films.…”

Section: Papermentioning

confidence: 55%

Effect of PEDOT:PSS on the performance of solution-processed blue phosphorescent organic light-emitting diodes with an exciplex host

et al. 2022

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Materials depth distribution and degradation of a FIrpic based solution-processed blue OLED

Cited by 17 publications

References 18 publications

High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence

High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence

The Root Causes of the Limited Stability of Solution‐Coated Small‐Molecule Organic Light‐Emitting Devices: Faster Host Aggregation by Exciton–Polaron Interactions

Effect of PEDOT:PSS on the performance of solution-processed blue phosphorescent organic light-emitting diodes with an exciplex host

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