Exciplex Electroluminescence of the New Organic Materials for Light-Emitting Diodes

Kaplunov, M. G.; Nikitenko, S.N.; Krasnikova, S. S.

doi:10.5772/51799

Cited by 2 publications

(10 citation statements)

References 67 publications

(110 reference statements)

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“…Therefore, the domains of individual materials formed in the blend as a result of the phase separation should not be larger than the exciton diffusion lengths (Lex) in these materials. The round-shaped clusters in the case of the toluene-cast MDMO-PPV/ [60]PCBM films are at least 25-30 times larger than the typical Lex values. Therefore a vast majority of excitons generated inside these clusters recombine since they cannot reach donor/acceptor interface where charge separation takes place.…”

Section: Fullerene Derivatives Formentioning

confidence: 91%

“…Smaller degree of the phase separation in this case allows the majority of excitons to reach the fullerene/polymer interface and contribute to the charge carrier generation. Improved morphology of the chlorobenzene-cast MDMO-PPV/ [60]PCBM blends results in the superior device performances: EQEs approach 50% and light power conversion efficiencies come close to 2.5% [65].…”

Section: Fullerene Derivatives Formentioning

confidence: 95%

“…On the contrary, films cast from chlorobenzene were much more homogeneous and the cluster size in that case did not exceed 50 nm. Illustrative AFM images recorded for the toluenecast and cholorobenzene-cast MDMO-PPV/ [60]PCBM films are shown in Fig. 31.…”

Section: Fullerene Derivatives Formentioning

confidence: 99%

“…Almost all these materials were evaluated in solar cells in combination with standard materials such as [60]PCBM and [70]PCBM. However, the photovoltaic performance of many systems is limited by non-optimal alignment of the energy levels of the electron donor and electron acceptor components.…”

Section: Fullerene Derivatives With Reduced Electron Aflnity As N-typmentioning

confidence: 99%

“…Nanostructured systems based on inorganic semiconductors have being investigated as promising materials for solar cells [55][56][57]. Several families of transition metal complexes, aromatic polyamines and polymers were designed as promising materials for organic light-emitting diodes (OLEDs) [58][59][60][61].…”

Section: Introductionmentioning

confidence: 99%

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Research in the Field of Organic Photovoltaics at the Institute for Problems of Chemical Physics of Russian Academy of Sciences

Troshin

2015

Organic Photonics and Photovoltaics

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In the present review we highlight the main research activities in the field of organic photonics and photovoltaics at the Institute for Problems of Chemical Physics of Russian Academy of Sciences (IPCP RAS). Extensive investigation of optical and electrical properties of π-conjugated organic compounds performed at IPCP RAS since 1960's resulted in design of many exciting materials representing organic semiconductors, metals and superconductors. Organic Schottky barrier and p/n junction photovoltaic devices constructed at IPCP RAS in 1960's and 1970's were among the first examples of reasonably efficient organic solar cells at that time. These early discoveries inspired younger generations of the researchers to continue the work of their mentors and explore the world of organic materials and photonic devices such as molecular photonic switches, organic light emitting diodes, solar cells, photodetectors, photoswitchable organic field-effect transistors and memory elements.

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Section: Fullerene Derivatives Formentioning

confidence: 91%

Section: Fullerene Derivatives Formentioning

confidence: 95%

Section: Fullerene Derivatives Formentioning

confidence: 99%

Section: Fullerene Derivatives With Reduced Electron Aflnity As N-typmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Research in the Field of Organic Photovoltaics at the Institute for Problems of Chemical Physics of Russian Academy of Sciences

Troshin

2015

Organic Photonics and Photovoltaics

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Predicting the Operational Stability of Phosphorescent OLED Host Molecules from First Principles: A Case Study

et al. 2017

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Low operational stability is the main limiting factor for commercialization of the blue phosphorescent organic light emitting diodes (PhOLEDs). The high energy and long lifetime of triplet excitons in blue PhOLEDs makes them more prone to degradation. Degradation of the host molecules in the emitting layer of PhOLEDs is one of the possible mechanisms leading to the luminosity loss in the course of device operation. Although possible degradation mechanisms are proposed in the literature, predicting the degradation kinetics is not straightforward because the evolution of excited states should be accurately described. We propose a computational scheme to assess the operational stability of PhOLED host materials. Our protocol relies on the usage of the multireference CASSCF/XMCQDPT2 method. In the present work we consider the degradation of four prototypical blue PhOLED host molecules in the charged and excited states as well as the degradation induced by exciton–polaron and exciton–exciton annihilation processes with the focus on breaking of exocyclic C–C or C–N bonds and triazine ring fission. By analyzing the calculated activation energies for different mechanisms we found the least stable states and the most probable dissociation pathways. On the basis of our computations, we derived a stability series for the studied molecules and determine the structural features that provide higher stability with respect to the unimolecular dissociation.

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Exciplex Electroluminescence of the New Organic Materials for Light-Emitting Diodes

Cited by 2 publications

References 67 publications

Research in the Field of Organic Photovoltaics at the Institute for Problems of Chemical Physics of Russian Academy of Sciences

Research in the Field of Organic Photovoltaics at the Institute for Problems of Chemical Physics of Russian Academy of Sciences

Predicting the Operational Stability of Phosphorescent OLED Host Molecules from First Principles: A Case Study

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