Enhanced electroluminescent performance by doping organic conjugated ionic compound into graphene oxide hole-injecting layer

Liu, Pan; Liu, Junna; Zhang, Bingbing; Zong, Wansheng; Xu, Shengang; Liu, Yingliang; Cao, Shaokui

doi:10.1007/s10853-019-03820-1

Cited by 14 publications

(7 citation statements)

References 31 publications

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“…Among the materials, the thermal conductivity of inorganic PCMs is higher than that of organic carbon materials; hence, the heat stored per unit mass is also higher. The thermal energy storage density calculation is compiled in references [9, 74]. The calculation method is as follows:

Q = \int_{T 2}^{T 1} C_{normalP} dt,

where Q is the thermal energy storage density, and C P is the specific heat capacity of PCMs.…”

Section: Resultsmentioning

confidence: 99%

“…The G band is associated with stretching vibrations of sp 2 C-C bonds in the graphitic structure, originating from double degenerate phonons (iTO and LO) with symmetry E 2g at the center of the Brillouin zone [72,73]. On the other hand, the D band corresponds to structural defects present on the material's surface [72][73][74]. The intensity ratio of the D band and G band in carbon materials, expressed as R = I D /I G, is employed to calculate the degree of disorder in the carbon material [54,64,75].…”

Section: Raman Analysis Of Graphite and Modified Graphitementioning

confidence: 99%

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The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

Shih

Liao

Tsai

et al. 2023

J Chinese Chemical Soc

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BackgroundIn this study, a series of phase change composites were developed. Phase change materials (PCMs) are substances with a high heat of fusion, thereby possessing great potential for solar thermal storage. However, their disadvantages, such as low thermal conductivity, phase separation, and supercooling, limit their further applications.ObjectiveIn this study, magnesium nitrate hexahydrate (MNH) was used as the phase change material, and different proportions of photothermal materials were added to improve the thermally conductive property and solar thermal storage efficiency of MNH.MethodsThis study used magnesium nitrate hexahydrate (MNH) as the substrate. In addition, different proportions of photothermal materials (carbon nanotubes, nano‐graphite, graphene, and partially reduced graphene oxide) were added to promote the efficiency of thermal energy storage. Additionally, a fixed ratio of carboxy methyl cellulose (CMC) was added. The phase change temperature and enthalpy change of the phase change material samples were explored and analyzed by differential scanning calorimeter (DSC). In addition, the thermophysical properties, photothermal storage performance, and thermal reliability analysis of the samples were investigated.ResultsThe results showed that the PCM composites prepared with nano‐graphite have higher latent heat and longer time of phase change. However, the composites prepared with carbon nanotubes (CNTs) have lower latent heat and a shorter time of phase change. Therefore, the partially reduced graphite oxide (PRGO)‐containing composites can retain the latent heat storage capacity of nano‐graphite and decrease the time of phase change, thereby improving the photothermal storage efficiency. The results reveal that the solar thermal storage efficiency of the composite with both CNTs and PRGO could reach up to 0.716.ConclusionsMCGOT‐1 and MCGOT‐2 have high latent heat values, and the phase transition time is short. Therefore, the thermal energy storage efficiency can be as high as 0.716. In addition, compared with related literature, the photothermal storage efficiency of MCGOT‐2 increased by about 2 times. Therefore, the environmentally friendly composites developed in this study have a high potential to be used in solar energy storage and energy‐saving systems.

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Q = \int_{T 2}^{T 1} C_{normalP} dt,

where Q is the thermal energy storage density, and C P is the specific heat capacity of PCMs.…”

Section: Resultsmentioning

confidence: 99%

Section: Raman Analysis Of Graphite and Modified Graphitementioning

confidence: 99%

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

Shih

Liao

Tsai

et al. 2023

J Chinese Chemical Soc

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“…The aim is to guarantee the effective interaction between photorefractive compound CRA-CSN 75 -Cz 25 and photosensitizer PC 61 BM avoiding the electrostatic association of electron-deficient PC 61 BM and electron-rich 2D graphitic nanosheets. This is also propitious to the effective exhibition of bridge-conducting action of 2D graphitic nanosheets in organic photorefractive composites [49][50][51][52]. The digital photograph of photorefractive devices is shown in Fig.…”

Section: Nanographite-doping Photorefractive Devicesmentioning

confidence: 93%

Graphitic nanosheets via two-dimensional polymerization enhancing organic all-optically controlled photorefractive performance

Liu

Zuo

et al. 2020

SN Appl. Sci.

Self Cite

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All-optically controlled devices are the attractive subjects due to their future applications in all-optically controlled networks and computers. In this work, two-dimensional (2D) graphite nanosheets are synthesized to improve organic photorefractive performance in the all-optical operation, i.e., the photorefractive performance under zero electric field. The synthetic process is performed by 2D-polymerizing electrophilic and nucleophilic carbon species under solvothermal effect, where [:C≡C:] 2− in calcium carbide is applied as nucleophilic carbon species and [C(Cl)] in carbon tetrachloride (CCl 4) as electrophilic carbon species. The polycarbonization reaction consists of 1D horizontal growth for nanoribbon and 2D vertical growth for single-layer graphene. Then, single-layer graphene nanosheets are aggregated via π-π stacking effect into 2D graphite nanosheets being composed of multilayer graphene nanosheets. Notably, the self-template characteristics induce the synchronous and alternate ongoing of three above processes. Interestingly, when these 2D graphite nanosheets are doped into organic photorefractive devices, the all-optically controlled photorefractive performance is effectively improved by enhancing the gain coefficient of two-beam coupling about 46.4% from 80.1 cm −1 of control device to 117.2 cm −1 of nanographite-doped device. This is attributed to the excellent electric conductance of 2D graphite nanosheets, which strengthens the charge separation under the nonuniform light field inside organic photorefractive devices. Then, the stronger built-in electric field will be induced so that the orientation enhancement effect is increased in organic photorefractive devices. This work provides an effective and facile approach to improve organic all-optically controlled photorefractive performance with 2D graphitic nanosheets. Weiwei Zuo and Mingming Li have contributed equally to this work.

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“…Organic optoelectronic materials are widely used these days because they have unique merits such as low cost and flexibility that traditional inorganic materials do not have [ 1 , 2 , 3 , 4 ]. Conjugated polymer is one of the most common organic optoelectronic materials [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Normally, conjugated polymer-based devices are produced in conjugated polymer solutions and the aggregation process can influence properties of these devices [ 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

The study of aggregation dynamics of conjugated polymer solutions in UV-vis absorbance spectra by considering the changing rate of average photon energy

Zhao

Sun

Zhao

2021

Heliyon

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The changing rate of average photon energy ('Eave) can describe the UV-vis absorbance spectra over a wavelength range. During the aggregation process of poly (3-hexylselenophene) (P3HS) and poly (3-hexylthiophene) (P3HT) solutions that form J-aggregates, 'Eave always decrease and the relationship between 'Eave and time is an exponential model. 'Eave can predict the time when the aggregation process is completed or how far the aggregation process is from the completion. Hansen Solubility Parameter (HSP) of the solvent can be used to predict 'Eave of some conjugated polymer solutions without doing experiments. ''E 0 ave (changing rate of 'Eave at the beginning of the aggregation process) has been calculated to reflect the overall changing trend of 'Eave and reflects the compatibility between solvent and solute. Therefore, 'Eave is suitable to describe the aggregation dynamics of conjugated polymer solutions by evaluating the aggregation process in UV-vis absorbance spectra.

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Enhanced electroluminescent performance by doping organic conjugated ionic compound into graphene oxide hole-injecting layer

Cited by 14 publications

References 31 publications

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

Graphitic nanosheets via two-dimensional polymerization enhancing organic all-optically controlled photorefractive performance

The study of aggregation dynamics of conjugated polymer solutions in UV-vis absorbance spectra by considering the changing rate of average photon energy

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