Efficient organic electroluminescent devices using single-layer doped polymer thin films with bipolar carrier transport abilities

Wu, Chung‐Chih; Sturm, James C.; Register, Richard A.; Tian, Jing; Dana, E. P.; Tnompson, M.E.

doi:10.1109/16.605468

Cited by 185 publications

(4 citation statements)

References 34 publications

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“…4), this should allow for charge and energy transfer to the DAD segments in the PLED devices. [63][64][65] Photoluminescence (PL) spectra can be seen in Fig. 4.…”

Section: Polymers For Nir Pledsmentioning

confidence: 99%

Multifunctional materials for OFETs, LEFETs and NIR PLEDs

et al. 2014

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“…4), this should allow for charge and energy transfer to the DAD segments in the PLED devices. [63][64][65] Photoluminescence (PL) spectra can be seen in Fig. 4.…”

Section: Polymers For Nir Pledsmentioning

confidence: 99%

Multifunctional materials for OFETs, LEFETs and NIR PLEDs

et al. 2014

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“…In all samples, no distinct reduction process was observed. The potential values obtained with respect to the Fc/Fc+ redox couple were converted the vacuum scale using the standard approximation that the Fc/Fc + HOMO level is -4.8 eV [35]. The HOMO energy levels were calculated from the onset of oxidation potential (E onset ) according to an empirical formulas;…”

Section: Electrochemical Studiesmentioning

confidence: 99%

Spectrophotometric, voltammetric and cytotoxicity studies of 2-hydroxy-5-methoxyacetophenone thiosemicarbazone and its N(4)-substituted derivatives: A combined experimental–computational study

Akgemci

Saf

Tasdemir

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…One possibility is that the electron and hole do not arrive and remain at the same luminescent molecules within the radiative recombination lifetime. For example, concentration quenching was observed when the total amount of guest luminescent materials exceeded 10% [ 15 , 16 ]. However, with the reduction in the amounts of luminescent materials, the full luminosity also reduced due to most carriers remaining at the host materials.…”

Section: Introductionmentioning

confidence: 99%

Exciton Up-Conversion by Well-Distributed Carbon Quantum Dots in Luminescent Materials for an Efficient Organic Light-Emitting Diode

2022

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In this work, we proposed an efficient and straightforward up-conversion process to enhance the external quantum efficiency in a red-emission organic light-emitting diode (OLED). The carbon quantum dots in the luminescent materials initiated the up-conversion by doping the (6,6)-phenyl-C61-butyric acid methyl ester (PCBM) in an amount of 0.001 wt. %, and the external quantum efficiency (EQE) increased from approximately 80 to 9.27% without spectrum change. The time-resolved photoluminescence was applied to understand the mechanism of EQE enhancement in the PCBM-doped OLED. Two decay-time constants fit the TRPL. After PCBM doping, the extended PL intensity indicated increased time constants. The time constants increased from 1.06 and 4.02 ns of the reference sample to 3.48 and 11.29 ns of the PCBM-doped material, respectively. The nonradiative energy transfer (NRET) mechanism was proposed responsible for the decay-time enhancement. The excitons in the PCBM, either by excitation or injection, will transfer to the phosphorescent material nonradiatively. As the PCBM has lower energy levels than the luminous material for electrons, the backward exciton transfer is a kind of up-conversion. With the increased amounts of excitons in the luminescent material, the luminescent external quantum efficiency and the decay-time increased. This up-conversion method is not limited to the red-emission OLED; it could also be applied to blue or green emission.

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Efficient organic electroluminescent devices using single-layer doped polymer thin films with bipolar carrier transport abilities

Cited by 185 publications

References 34 publications

Multifunctional materials for OFETs, LEFETs and NIR PLEDs

Multifunctional materials for OFETs, LEFETs and NIR PLEDs

Spectrophotometric, voltammetric and cytotoxicity studies of 2-hydroxy-5-methoxyacetophenone thiosemicarbazone and its N(4)-substituted derivatives: A combined experimental–computational study

Exciton Up-Conversion by Well-Distributed Carbon Quantum Dots in Luminescent Materials for an Efficient Organic Light-Emitting Diode

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