New Organic Electroluminescent Materials

Kaplunov, M. G.; Krasnikova, S. S.; Yakushchenko, I. K.; Shamaev, S. N.; Pivovarov, A. P.; Ефимов, О. Н.; Ermakov, O. N.; Stakharny, S. A.

doi:10.1080/15421400590891317

Cited by 18 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason is, in general, the variation range of the wavelength emitted by the external radiation is narrow. [ 30–33 ] For the electroluminous color change triggered by radiation, the luminophore used in the electroluminescence (EL) must have strong photoluminescence (PL) and the PL wavelength must have a large difference from the EL wavelength. In addition, the PL and EL are desirable to be controlled independently so that the resulting color change is predictably tunable.…”

Section: Figurementioning

confidence: 99%

Electro‐Photoluminescence Color Change for Deformable Visual Encryption

et al. 2020

View full text Add to dashboard Cite

In order to utilize the concept of the radiation-responsive luminous color change and develop further for practical uses, electroluminous system can be a good platform because the light intensity can be controlled. Surprisingly, the radiation-responsive electroluminous color change has not been investigated so far. The reason is, in general, the variation range of the wavelength emitted by the external radiation is narrow. [30][31][32][33] For the electroluminous color change triggered by radiation, the luminophore used in the electroluminescence (EL) must have strong photoluminescence (PL) and the PL wavelength must have a large difference from the EL wavelength. In addition, the PL and EL are desirable to be controlled independently so that the resulting color change is predictably tunable. In this study, we present, for the first time, a UV-responsive electroluminous color changing system, called electrophotoluminescence (EPL) color change. As a model system, we used the stretchable alternating current electroluminescence (ACEL) in which the electro-luminophores are photoluminescent as well. We investigated systematically the effects of the ACEL frequency and voltage to obtain a wide range of color variation. We utilized the EPL color changing system to demon strate a deformable visual encryption on the skin of a soft robotic rover.Even though this study focuses on controlling the EPL colors and understanding the physical origins, the device fabrication required material advances in several aspects. The device structure is illustrated in Figure 1b (top) and the cross-sectional scanning electron microscopy (SEM) image is presented in Figure 1c. A light-emitting layer (150 µm in thickness) was sandwiched between two stretchable electrodes. A hydrogel ionic conductor or indium-tin oxide (ITO) was used as the top electrode to ensure high transparency in the UV-vis range ( Figure S1, Supporting Information). In order to ensure adhesion of the hydrogel ionic conductor and the light-emitting layer under deformation, surface of the light-emitting layer was treated with benzophenone. The benzophenone treatment increased the turbidity and modulus of the polymer matrix (Ecoflex 00-30) in the light-emitting layer. Therefore, the benzophenone treatment for 10 min was chosen as an optimum condition for achieving enough adhesion without large increase of turbidity and modulus. The dependence of the modulus and transmittance on the benzophenone treatment time is shown in the Figure S2, Supporting Information.Although structural coloring and photoluminescence (PL) have been investigated for radiation-responsive color change, electroluminescence (EL) has not been used for the radiation-responsive system. An electrophotoluminescence (EPL) color change is presented here. The phosphors in the alternating current electroluminescence (ACEL) act simultaneously as electro-luminophores and photo-luminophores. The EPL chromaticity is systematically investigated depending on the ACEL frequency and UV intensity. It is found that the PL va...

show abstract

Section: Figurementioning

confidence: 99%

Electro‐Photoluminescence Color Change for Deformable Visual Encryption

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Particular attention is drawn to zinc complexes of chelating azomethine ligands, owing to their photo- and electroluminescent properties, which allow their use as emitting layers in OLED devices, which have many advantages in terms of power consumption, brightness, and color compared to traditional sources [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. These complexes have a number of advantages, having high thermal stability, volatility, and solubility; they are relatively simple for synthesis, non-toxic and cheap.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structure, Spectral-Luminescent Properties, and Biological Activity of Chlorine-Substituted N-[2-(Phenyliminomethyl)phenyl]-4-methylbenzenesulfamide and Their Zinc(II) Complexes

Бурлов

Власенко

Milutka

et al. 2022

IJMS

View full text Add to dashboard Cite

New azomethine compounds of 2-(N-tosylamino)benzaldehyde or 5-chloro-2-(N-tosylamino)benzaldehyde and the corresponding chlorine-substituted anilines, zinc(II) complexes based on them have been synthesized. The structures of azomethines and their complexes were determined by elemental analysis, IR, 1H NMR, X-ray spectroscopy, and X-ray diffraction. It is found that all ZnL2 complexes have a tetrahedral structure according to XAFS and X-ray diffraction data. The photoluminescent properties of azomethines and zinc complexes in methylene chloride solution and in solid form have been studied. It is shown that the photoluminescence quantum yields of solid samples of the complexes are an order of magnitude higher compared to the solutions and range from 11.34% to 48.3%. The thermal properties of Zn(II) complexes were determined by thermal gravimetric analysis (TGA) and differential scanning calorimetry. The TGA curves of all the compounds suggest their high thermal stability up to temperatures higher than 290 °C. The electrochemical properties of all complexes were investigated by the cyclic voltammetry method. The multilayered devices ITO/PEDOT:PSS/NPD/Zn complex/ TPBI/LiF/Al with wide electroluminescence (EL) color range spanning the range from bluish-green (494 nm) to green (533 nm) and the high values of brightness, current and power efficiency were fabricated. The biological activity of azomethines and zinc complexes has been studied. In the case of complexes, the protistocidal activity of the zinc complex with azomethine of 5-chloro-2-(N-tosylamino)benzaldehyde with 4-chloroaniline was two times higher than the activity of the reference drug toltrazuril.

show abstract

“…[1][2][3][4] Therefore, they received considerable attentions and have been applied extensively in the fields of optical functional materials. [5][6][7][8] The study about the optical properties and the structure-property relationship of aryl ethylene were also made widely in past decades. [9][10][11][12][13][14] 1-Furyl/thienyl-2-aryl ethylene XCH=CHArYs (X contains furyl or thienyl group) is a kind of special aryl ethylene derivative with heteroaryl.…”

Section: Introductionmentioning

confidence: 99%

Substituent effects on the stretching vibration frequencies of C=C bridge bond in aryl ethylene with furyl or thienyl group

Wang

Cao

2022

J of Physical Organic Chem

View full text Add to dashboard Cite

To explore the substituent effects on the stretching vibration frequencies ν C=C of C=C bridge bond in 1-furyl/thienyl-2-aryl ethylene XCH=CHArYs, 60 samples of XCH=CHArYs were synthesized, and their infrared absorption spectra were recorded. The regression analyses between the ν C=C values of XCH=CHArYs and the substituent parameters of X and Y were made in detail. Finally, an optimality equation (shown as Equation 3) quantifying the ν C=C values of XCH=CHArYs was obtained. It shows that the substituent effects on the ν C=C values of XCH=CHArYs mainly reflect in Hammett constant of X and the excited-state substituent constants of X and Y. Among the parameters in Equation (3), the excited-state substituent constant of X contributes the most to the ν C=C values of XCH=CHArYs as seen from the fraction contributions. On the whole, the contribution of X to the ν C=C values of XCH=CHArYs is larger than that of Y.

show abstract

New Organic Electroluminescent Materials

Cited by 18 publications

References 10 publications

Electro‐Photoluminescence Color Change for Deformable Visual Encryption

Electro‐Photoluminescence Color Change for Deformable Visual Encryption

Synthesis, Structure, Spectral-Luminescent Properties, and Biological Activity of Chlorine-Substituted N-[2-(Phenyliminomethyl)phenyl]-4-methylbenzenesulfamide and Their Zinc(II) Complexes

Substituent effects on the stretching vibration frequencies of C=C bridge bond in aryl ethylene with furyl or thienyl group

Contact Info

Product

Resources

About