Effect of energy transfer on electroluminescent performance in blend-layer organic light-emitting devices

Zhang, Shuping; Lü, Zhe; Peng, Yajing; Liu, Yuqiang; Yang, Yanqiang

doi:10.1016/j.jlumin.2008.02.005

Cited by 3 publications

(1 citation statement)

References 21 publications

(21 reference statements)

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“…In the ohmic zone, the mobile charge carriers are intrinsically present, so that the charge carriers' density needs to be known to say something about the charge mobility. SCLC is applicable to single carrier injection devices, in this case for electron transport through the quinoline ligands of the IrQ(ppy) 2 , in a similar way with the Alq 3 compound used as electron transport material [54]. In our case, the organometallic has both capabilities, acting as ETL and as electroluminescent material.…”

Section: Discussionmentioning

confidence: 96%

Organometallic Coatings for Electroluminescence Applications

Poloşan

Ciobotaru

2020

Coatings

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Organometallic compounds embedded in thin films are widely used for Organic Light-Emitting Diodes (OLED), but their functionalities are strongly correlated with the intrinsic properties of those films. Controlling the concentration of the organometallics in the active layers influences the OLED performances through the aggregation processes. These aggregations could lead to crystallization processes that significantly modify the efficiency of light emission in the case of electroluminescent devices. For functional devices with organometallic-based thin films, some improvements, such as the optimization of the charge injection, are needed to increase the light output. One dual emitter IrQ(ppy)2 organometallic compound was chosen for the aggregation correlations from a multitude of macromolecular organometallics that exist on the market for OLED applications. The choice of additional layers like conductive polymers or small molecules as host for the active layer may significantly influence the performances of the OLED based on the IrQ(ppy)2 organometallic compound. The use of the CBP small molecule layer may lead to an increase in the electroluminescence versus the applied voltage.

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Section: Discussionmentioning

confidence: 96%

Organometallic Coatings for Electroluminescence Applications

Poloşan

Ciobotaru

2020

Coatings

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On the interactions between molecules in an off-resonant laser beam: Evaluating the response to energy migration and optically induced pair forces

Andrews

Leeder

2009

The Journal of Chemical Physics

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Electronically excited molecules interact with their neighbors differently from their ground-state counterparts. Any migration of the excitation between molecules can modify intermolecular forces, reflecting changes to a local potential energy landscape. It emerges that throughput off-resonant radiation can also produce significant additional effects. The context for the present analysis of the mechanisms is a range of chemical and physical processes that fundamentally depend on intermolecular interactions resulting from second and fourth-order electric-dipole couplings. The most familiar are static dipole-dipole interactions, resonance energy transfer ͑both second-order interactions͒, and dispersion forces ͑fourth order͒. For neighboring molecules subjected to off-resonant light, additional forms of intermolecular interaction arise in the fourth order, including radiation-induced energy transfer and optical binding. Here, in a quantum electrodynamical formulation, these phenomena are cast in a unified description that establishes their inter-relationship and connectivity at a fundamental level. Theory is then developed for systems in which the interplay of these forms of interaction can be readily identified and analyzed in terms of dynamical behavior. The results are potentially significant in Förster measurements of conformational change and in the operation of microelectromechanical and nanoelectromechanical devices.

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Quantum electrodynamical theory of high-efficiency excitation energy transfer in laser-driven nanostructure systems

et al. 2016

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A fundamental theory is developed for describing laser-driven resonance energy transfer (RET) in dimensionally constrained nanostructureswithin the framework of quantum electrodynamics. The process of RET communicates electronic excitation between suitably disposed emitter and detector particles in close proximity, activated by the initial excitation of the emitter. Here, we demonstrate that the transfer rate can be significantly increased by propagation of an auxiliary laser beam through a pair of nanostructure particles. This is due to the higher order perturbative contribution to the F¨orster-type RET, in which laser field is applied to stimulate the energy transfer process. We construct a detailed picture of how excitation energy transfer is affected by an off-resonant radiation field, which includes the derivation of second and fourth order quantum amplitudes. The analysis delivers detailed results for the dependence of the transfer rates on orientational, distance, and laser intensity factor, providing a comprehensive fundamental understanding of laser-driven RET in nanostructures. The results of the derivations demonstrate that the geometry of the system exercises considerable control over the laser-assisted RET mechanism. Thus, under favorable conformational conditions and relative spacing of donor-acceptor nanostructures, the effect of the auxiliary laser beam is shown to produce up to 70% enhancement in the energy migration rate. This degree of control allows optical switching applications to be identified

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Effect of energy transfer on electroluminescent performance in blend-layer organic light-emitting devices

Cited by 3 publications

References 21 publications

Organometallic Coatings for Electroluminescence Applications

Organometallic Coatings for Electroluminescence Applications

On the interactions between molecules in an off-resonant laser beam: Evaluating the response to energy migration and optically induced pair forces

Quantum electrodynamical theory of high-efficiency excitation energy transfer in laser-driven nanostructure systems

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