Enhancement in fluorescence quantum yield of MEH-PPV:BT blends for polymer light emitting diode applications

Nimith, K.M.; Satyanarayan, M. N.; Umesh, G.

doi:10.1016/j.optmat.2018.04.046

Cited by 33 publications

(17 citation statements)

References 35 publications

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“…It can be estimated using the formula Here Q 0 is the quantum yield, and n is the refractive index of the medium ( n chloroform = 1.45) . The quantum yield of AlQ 3 is 0.29, and that of MEH-PPV is 0.37. , The calculated critical transfer distance for the donor–donor ( R DD ), acceptor–acceptor ( R AA ), and donor–acceptor ( R DA ) systems is 14, 34, and 52 Å, respectively.…”

Section: Resultsmentioning

confidence: 95%

“…Interestingly, many conjugated light-emitting polymers are hole conductive and show low electron mobility, therefore having low efficiency . However, doping of an electron transport material can enhance the efficiency of these polymers. − Careful selection of these dopants and their concentration, in the blended polymer, improves both the carrier injection and transport properties of the semiconducting polymer. , …”

Section: Introductionmentioning

confidence: 99%

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Excitation Energy Transfer/Migration between Tris(8-hydroxyquinoline) Aluminum and Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] in Chloroform

et al. 2020

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Excitation energy transfer/migration between fluorescent electron transport molecule tris(8-hydroxyquinoline) aluminum (donor) and fluorescent hole transport polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (acceptor) were studied in chloroform solution at room temperature using steady-state and time-domain fluorescence measurements. The blend of this pair is widely used in the fabrication of organic light-emitting diode. The considerable overlap integral between the emission spectrum of donor and absorption spectrum of acceptor indicates high donor−acceptor interaction, and the effective enhancement of the acceptor fluorescence along with a decrease in fluorescence intensity of donor by exciting the donor states characterized the excitation energy transfer between them. Relatively faster decay of donor in the presence of a higher concentration of acceptor followed the Forster kind of long-range fluorescence resonance energy transfer, which is illustrated by the agreement in the values of the energy transfer parameters observed from the fluorescence decay analysis and the values calculated from the spectral overlap. However, at lower acceptor concentrations, the excitation energy migration and diffusion/intrachain interaction influence the kinetics, resulting in a significant difference in the observed and calculated value of the energy transfer parameters. The influence of intrachain and interchain interactions during nonradiative excitation energy transfer is confirmed by the donor and acceptor decay dynamics on increasing acceptor concentration in donor−acceptor solution. No evidence of excimer formation is noticed in the donor−acceptor solution.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Excitation Energy Transfer/Migration between Tris(8-hydroxyquinoline) Aluminum and Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] in Chloroform

et al. 2020

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“…The current density–voltage characteristics were recorded after annealing the thin film on ITO under ambient conditions as shown in Figure . I–V characteristics of MEH‐PPV single‐layer device is known to show higher turn‐on voltage of about 12 V, [ 34 ] whereas PPY1 that has lower degree of pyrazoline showed higher turn‐on voltage of 9.6 V while PPY2 that has higher degree of pyrazoline content showed lower turn‐on voltage of 5.3 V. On comparison with PLEDs containing poly(fluorene) as backbone that requires difficult synthetic strategies, the turn‐on voltage is around 6 V only in the presence of multilayered architecture. [ 35,36 ] Carbazole‐containing polymer that showed ambipolar characteristics too required multilayered architecture to attain low turn‐on voltage.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Solution Processable Poly(pyrazolines)

Jayalakshmi

Keerthika

Santhanagopal

2020

Macro Chemistry & Physics

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Solution‐processable poly(dibenzalacetone) and poly(dibenzalcyclohexanone) are prepared by the condensation of 1,4‐dialkoxy‐bisbenzaldehyde and acetone/cyclohexanone using classic Claisen–Schmidt condensation. The prepared polymers are readily soluble in common organic solvents due to the presence of alkoxy chains present on the aromatic ring. The availability of α,β‐unsaturated ketone on the backbone is readily functionalized with hydrazine hydrate to obtain poly(pyrazoline acetate), a nonconjugated polymer on the backbone, which shows enhanced emission characteristics on comparison with the pristine polymer and small molecule analogues. The highest occupied molecular orbital–lowest unoccupied molecular orbital (HOMO–LUMO) of levels of poly(pyrazolines) has a band gap of 1.54 eV as calculated from cyclic voltammetry and UV–vis studies. Uniform thin film is obtained by spin casting as 1% solution on chlorobenzene and annealing under vacuum. Atomic force microscopy analysis shows fine morphology of the thin film. I–V characterization of the film shows low turn‐on voltage of 5.3 V. HOMO–LUMO is calculated by density functional theory and the result suggests that these molecules have great potential toward polymer organic light‐emitting diode applications.

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“…PT is widely used in polymer-based OLEDs (PLEDs), OSCs, and chemical sensors due to its conductive, luminescence, and electrochromic properties, as well as its high versatility of synthesis [ 51 , 52 , 53 ]. PPV derivatives are also commonly used in PLEDs and OSCs [ 54 , 55 , 56 ]. PPy has diverse applications due to its low relative cost, electronic properties, ease of processing, and versatility of synthesis, being widely used in the active layer of gas sensors [ 57 , 58 , 59 , 60 ].…”

Section: Methodsmentioning

confidence: 99%

Effects of Mechanical Deformation on the Opto-Electronic Responses, Reactivity, and Performance of Conjugated Polymers: A DFT Study

Cachaneski-Lopes

Batagin‐Neto

2022

Polymers

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The development of polymers for optoelectronic applications is an important research area; however, a deeper understanding of the effects induced by mechanical deformations on their intrinsic properties is needed to expand their applicability and improve their durability. Despite the number of recent studies on the mechanochemistry of organic materials, the basic knowledge and applicability of such concepts in these materials are far from those for their inorganic counterparts. To bring light to this, here we employ molecular modeling techniques to evaluate the effects of mechanical deformations on the structural, optoelectronic, and reactivity properties of traditional semiconducting polymers, such as polyaniline (PANI), polythiophene (PT), poly (p-phenylene vinylene) (PPV), and polypyrrole (PPy). For this purpose, density functional theory (DFT)-based calculations were conducted for the distinct systems at varied stretching levels in order to identify the influence of structural deformations on the electronic structure of the systems. In general, it is noticed that the elongation process leads to an increase in electronic gaps, hypsochromic effects in the optical absorption spectrum, and small changes in local reactivities. Such changes can influence the performance of polymer-based devices, allowing us to establish significant structure deformation response relationships.

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Enhancement in fluorescence quantum yield of MEH-PPV:BT blends for polymer light emitting diode applications

Cited by 33 publications

References 35 publications

Excitation Energy Transfer/Migration between Tris(8-hydroxyquinoline) Aluminum and Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] in Chloroform

Excitation Energy Transfer/Migration between Tris(8-hydroxyquinoline) Aluminum and Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] in Chloroform

Synthesis and Characterization of Solution Processable Poly(pyrazolines)

Effects of Mechanical Deformation on the Opto-Electronic Responses, Reactivity, and Performance of Conjugated Polymers: A DFT Study

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