Highly efficient tandem blue phosphorescent organic LEDs with external quantum efficiency exceeding 42%

Ai, Chen; Wang, Zhen; Xie, Jiafeng; Chen, Jiawen; Lu, Yongsheng; Zhang, Wenxia; Lu, Feiping

doi:10.35848/1882-0786/ab6ed6

Cited by 8 publications

(5 citation statements)

References 36 publications

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“…Organic semiconductors have been successfully employed in developing several optoelectronic devices [1][2][3][4] . Organic Photovoltaics (OPVs) have not yet reached the desired maturity concerning their physicochemical stability and efficiency 5 .…”

Section: Introductionmentioning

confidence: 99%

Organic Electronics from Nature: Investigation of the Electronic and Optical Properties of the Isomers of Bixin and Norbixin Present in the Achiote Seeds

Lima

Crispim

Neto

et al. 2021

Preprint

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Organic semiconductors have been widely employed in developing new green energy solutions with good cost-efficiency compromise, such as Organic Photovoltaics (OPVs). The light-harvesting process in OPVs is a crucial aspect, which still needs improvements. In this context, the Dye-sensitized solar cells (DSSCs) have arisen as a technically and economically credible alternatives. In this work, we have performed density functional theory (DFT) calculations to investigate the electronic and optical properties of the four natural dyes found in the seeds of annatto (Bixa Orellana L.), which is a natural dye widely found in tropical America. Different DFT functionals, and basis sets, were used in the calculations of the bixin, norbixin, and their trans-isomers (molecules present in Bixa Orellana L.). All molecules present a conjugated backbone with nine double bonds. We observed that the planarity of the molecules and their similar extension for the conjugation pathways provide substantially delocalized wavefunctions of the frontier orbitals and similar values for their energies. Moreover, our findings showed a strong absorption peak in the blue region and the absorption band over the visible spectrum, thus indicating that molecules are good candidates for organic electronic and optoelectronic applications. The results were contrasted with the experimental data.

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Section: Introductionmentioning

confidence: 99%

Organic Electronics from Nature: Investigation of the Electronic and Optical Properties of the Isomers of Bixin and Norbixin Present in the Achiote Seeds

Lima

Crispim

Neto

et al. 2021

Preprint

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“…Zinc phthalocyanine thin films are one of the important organic compounds that find applications as nonlinear optical systems. The third‐order nonlinear optical properties of this material make it attractive for use as light absorber suitable for fabricating photovoltaic devices . Organic light‐emitting diodes which use ZnPc as charge generators exhibited an external quantum efficiency of 42.9% at 100 cd m −2 .…”

Section: Introductionmentioning

confidence: 99%

“…The third-order nonlinear optical properties of this material make it attractive for use as light absorber suitable for fabricating photovoltaic devices. [1,2] Organic light-emitting diodes which use ZnPc as charge generators exhibited an external quantum efficiency of 42.9% at 100 cd m À2 . [2] In addition, ZnPc thin films are confirmed to be suitable for use as optical filters.…”

Section: Introductionmentioning

confidence: 99%

“…[1,2] Organic light-emitting diodes which use ZnPc as charge generators exhibited an external quantum efficiency of 42.9% at 100 cd m À2 . [2] In addition, ZnPc thin films are confirmed to be suitable for use as optical filters. The transmittance spectra which comprise peaks and valleys within the visible and infrared ranges of light make the ZnPc layer an ideal optical filter.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric Dispersion at the Mn/ZnPc Interfaces

Qasrawi

Zyoud

2020

Physica Status Solidi (b)

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Herein, the effects of manganese transparent (150 nm) substrates on the structural, nonlinear optical, and dielectric properties of zinc phthalocyanine are explored. ZnPc thin films are observed to exhibit deformed crystal structure associated with remarkable enhancement in the light absorbability by 21 times at 2.62 eV and by 173 times in the near‐infrared (NIR) region of light upon replacement of glass by transparent Mn substrates. The Mn layer also causes a redshift in the energy bandgap, allows generation of free carrier absorption process and increases the dielectric constant by more than 169% in the NIR region. The interaction between the manganese substrates with the organic ZnPc thin layers decreases the free holes density, widens the plasmon frequency range, and improves the drift mobility of holes. The nonlinear dielectric response with the highly improved light absorbability in the NIR range of light nominates the Mn/ZnPc thin films for optoelectronic applications.

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“…[1][2][3][4] To date, the OLED panels are mainly utilized in cellular phones and ultrahigh definition television. [5][6][7] The limitations of their commercialization are the high price and the inferior thermal stability of organic materials under high brightness. [8][9][10][11] Consequently, the research on the thermal stability of OLEDs plays a vital role.…”

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confidence: 99%

Highly thermal-stable organic light-emitting diodes with a bulk heterojunction interfacial modification layer

Wei

Fan

et al. 2022

Jpn. J. Appl. Phys.

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We report highly thermal-stable organic light-emitting diodes (OLEDs) by introducing a interfacial modification layer (IML), consisting of the N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)-benzidine (NPB):MoO3 bulk heterojunction. The IML can increase the thermal resistance of 4,4′-cyclohexylidenebis[N,N-bis(4-methylphenyl)benzenamine] (TAPC) hole transport layer to be higher than its glass transition temperature. The OLED with the IML can endure a high-temperature of 100 °C with the current efficiency of 51.82 cd A−1 and low efficiency roll-off. The optimized thermal stability of OLED is not only due to the thermally stable IML but also resulted from the well-matched energy level between anode and TAPC with the help of IML.

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Highly efficient tandem blue phosphorescent organic LEDs with external quantum efficiency exceeding 42%

Cited by 8 publications

References 36 publications

Organic Electronics from Nature: Investigation of the Electronic and Optical Properties of the Isomers of Bixin and Norbixin Present in the Achiote Seeds

Organic Electronics from Nature: Investigation of the Electronic and Optical Properties of the Isomers of Bixin and Norbixin Present in the Achiote Seeds

Dielectric Dispersion at the Mn/ZnPc Interfaces

Highly thermal-stable organic light-emitting diodes with a bulk heterojunction interfacial modification layer

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