Long-lived and highly efficient green and blue phosphorescent emitters and device architectures for OLED displays

Eickhoff, Christian; Murer, Peter; Geßner, Thomas; Birnstock, Jan; Kröger, Michael; Choi, Zungsun; Watanabe, Shinji; May, Falk; Lennartz, Christian; Stengel, Ilona; Münster, Ingo; Kahle, K.; Wagenblast, Gerhard; Mangold, Hannah

doi:10.1117/12.2199079

SPIE Proceedings

2015

DOI: 10.1117/12.2199079

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Long-lived and highly efficient green and blue phosphorescent emitters and device architectures for OLED displays

Christian Eickhoff

Peter Murer

Thomas Geßner

et al.

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Cited by 3 publications

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“…By TADF materials, as in PhOLEDs, an internal quantum of efficiency of 100% is achievable because all excitons can be converted to light [49]. In addition, TADF OLEDs promise a longer device lifetime [50]. The TADF process can occur if the energy gap (ΔE ST ) between the first singlet (S 1 ) and the first triplet excited states (T 1 ) is low enough (<.2 eV) [51][52][53].…”

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Organic light‐emitting diode behaviors of some synthesized platinum(II)‐based complexes

Üngördü

2023

Int J of Quantum Chemistry

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Organic light‐emitting light diodes (OLEDs) have been increasingly used in displays, replacing liquid‐crystal displays (LCD) and light‐emitting diodes (LEDs) panels. The increase in commercial use of OLED has led to the search for OLED with high performance. For that reason, the OLED properties of monomers and dimers of some synthesized platinum(II)‐based complexes were estimated by using different computational chemistry tools with different codes. The electron/hole reorganization energies, the adiabatic/vertical ionization potentials, the adiabatic/vertical electron affinities, the chemical hardness values, the dipole moments, the frontier orbital shapes/energy levels, the energy gaps, the emission wavelengths, spin‐orbit matrix elements, the rates of reverse intersystem crossing and intersystem crossing of the investigated complexes were determined. From the theoretically obtained data, it was found that Pt(hppz)2 and Pt(fppz)2 complexes can be used as electron transfer material. Furthermore, it was stated that Pt(f2bipz)(bpy) is both electron‐blocking layer and hole blocking layer materials. Moreover, it was noted that that PtOEP complex can be utilized as a good electron injection layer and hole injection layer material. Addition to these, it was emphasized that that Pt(f2bipz)(bpy) can be considered as a good candidate for near infrared organic light emitting diodes and thermal activated delayed fluorescent organic light emitting diodes. In light of computational chemistry, it should be expected that the study will provide a great contribution to studies related to organic light emitting diodes.

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confidence: 99%

Organic light‐emitting diode behaviors of some synthesized platinum(II)‐based complexes

Üngördü

2023

Int J of Quantum Chemistry

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Transient electroluminescence on pristine and degraded phosphorescent blue OLEDs

Niu

Blom

May

et al. 2017

Journal of Applied Physics

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In state-of-the-art blue phosphorescent organic light-emitting diode (PHOLED) device architectures, electrons and holes are injected into the emissive layer, where they are carried by the emitting and hole transporting units, respectively. Using transient electroluminescence measurements, we disentangle the contribution of the electrons and holes on the transport and efficiency of both pristine and degraded PHOLEDs. By varying the concentration of hole transporting units, we show that for pristine PHOLEDs, the transport is electron dominated. Furthermore, degradation of the PHOLEDs upon electrical aging is not related to the hole transport but is governed by a decrease in the electron transport due to the formation of electron traps.

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Computer aided design of stable and efficient OLEDs

Paterson

May

Andrienko

2020

Journal of Applied Physics

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Organic light emitting diodes (OLEDs) offer a unique alternative to traditional display technologies. Tailored device architecture can offer properties such as flexibility and transparency, presenting unparalleled application possibilities. Commercial advancement of OLEDs is highly anticipated, and continued research is vital for improving device efficiency and lifetime. The performance of an OLED relies on an intricate balance between stability, efficiency, operational driving voltage, and color coordinates, with the aim of optimizing these parameters by employing an appropriate material design. Multiscale simulation techniques can aid with the rational design of these materials, in order to overcome existing shortcomings. For example, extensive research has focused on the emissive layer and the obstacles surrounding blue OLEDs, in particular, the trade-off between stability and efficiency, while preserving blue emission. More generally, due to the vast number of contending organic materials and with experimental pre-screening being notoriously time-consuming, a complementary in silico approach can be considerably beneficial. The ultimate goal of simulations is the prediction of device properties from chemical composition, prior to synthesis. However, various challenges must be overcome to bring this to a realization, some of which are discussed in this Perspective. Computer aided design is becoming an essential component for future OLED developments, and with the field shifting toward machine learning based approaches, in silico pre-screening is the future of material design.

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Long-lived and highly efficient green and blue phosphorescent emitters and device architectures for OLED displays

Cited by 3 publications

References 0 publications

Organic light‐emitting diode behaviors of some synthesized platinum(II)‐based complexes

Organic light‐emitting diode behaviors of some synthesized platinum(II)‐based complexes

Transient electroluminescence on pristine and degraded phosphorescent blue OLEDs

Computer aided design of stable and efficient OLEDs

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