Luminescent Cationic Copper(I) Complexes: Synthesis, Photophysical Properties and Application in Light-Emitting Electrochemical Cells

In recent years, the photophysical properties of crystalline metal-organic frameworks (MOFs) have become increasingly relevant for their potential application in light-emitting devices, photovoltaics, nonlinear optics and sensing. The availability of high-quality experimental data for such systems makes them ideally suited for a validation of quantum mechanical simulations, aiming at an in-depth atomistic understanding of photophysical phenomena. Here we present a computational DFT study of the absorption and emission characteristics of a Zn-based surface-anchored metal-organic framework (Zn-SURMOF-2) containing anthracenedibenzoic acid (ADB) as linker. Combining band-structure and cluster-based simulations on ADB chromophores in various conformations and aggregation states, we are able to provide a detailed explanation of the experimentally observed photophysical properties of Zn-ADB SURMOF-2: The unexpected (weak) red-shift of the absorption maxima upon incorporating ADB chromophores into SURMOF-2 can be explained by a combination of excitonic coupling effects with conformational changes of the chromophores already in their ground state. As far as the unusually large red-shift of the emission of Zn-ADB SURMOF-2 is concerned, based on our simulations, we attribute it to a modification of the exciton coupling compared to conventional H-aggregates, which results from a relative slip of the centers of neighboring chromophores upon incorporation in Zn-ADB SURMOF-2.

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Synthesis, Study, and Application of Pd(II) Hydrazone Complexes as the Emissive Components of Single-Layer Light-Emitting Electrochemical Cells

Inorganic Chemistry ◽

10.1021/acs.inorgchem.0c03102 ◽

2021 ◽

Author(s):

Marzieh Emami ◽

Hashem Shahroosvand ◽

Rahman Bikas ◽

Tadeusz Lis ◽

Cody Daneluik ◽

...

Keyword(s):

Single Layer ◽

Electrochemical Cells ◽

Light Emitting ◽

Hydrazone Complexes

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Enhancing carrier injection efficiency of light-emitting electrochemical cells based on Cationic Ir(III) complexes by interface modification

Optical Materials ◽

10.1016/j.optmat.2021.111127 ◽

2021 ◽

Vol 117 ◽

pp. 111127

Author(s):

Zhixin Chen ◽

Qunying Zeng ◽

Kaiyu Yang ◽

Zhongmin Su ◽

Guogang Shan ◽

...

Keyword(s):

Electrochemical Cells ◽

Carrier Injection ◽

Injection Efficiency ◽

Light Emitting ◽

Interface Modification

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Effects of electron-withdrawing groups in imidazole-phenanthroline ligands and their influence on the photophysical properties of EuIII complexes for white light-emitting diodes

New Journal of Chemistry ◽

10.1039/c7nj02291c ◽

2017 ◽

Vol 41 (18) ◽

pp. 9826-9839 ◽

Cited By ~ 8

Author(s):

Boddula Rajamouli ◽

Rachna Devi ◽

Abhijeet Mohanty ◽

Venkata Krishnan ◽

Sivakumar Vaidyanathan

Keyword(s):

Thin Film ◽

Quantum Yield ◽

White Light ◽

Light Emitting Diode ◽

Photophysical Properties ◽

Red Light ◽

Europium Complexes ◽

Light Emitting ◽

White Light Emitting Diodes ◽

Phenanthroline Ligands

The red light emitting diode (LED) was fabricated by using europium complexes with InGaN LED (395 nm) and shown digital images, corresponding CIE color coordinates (red region) as well as obtained highest quantum yield of the thin film (78.7%).

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Synthesis of red-emitting cationic Ir (III) complex and its application in white light-emitting electrochemical cells

Organic Electronics ◽

10.1016/j.orgel.2016.12.052 ◽

2017 ◽

Vol 42 ◽

pp. 303-308 ◽

Cited By ~ 9

Author(s):

Qunying Zeng ◽

Fushan Li ◽

Tailiang Guo ◽

Guogang Shan ◽

Zhongmin Su

Keyword(s):

White Light ◽

Electrochemical Cells ◽

Light Emitting

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Near Unity PLQY and High Stability of Barium Thiocyanate Based All-Inorganic Perovskites and Their Applications in White Light-Emitting Diodes

Photonics ◽

10.3390/photonics8060209 ◽

2021 ◽

Vol 8 (6) ◽

pp. 209

Author(s):

Gopi Chandra Adhikari ◽

Saroj Thapa ◽

Yang Yue ◽

Hongyang Zhu ◽

Peifen Zhu

Keyword(s):

White Light ◽

Large Scale ◽

Light Emitting Diode ◽

Photophysical Properties ◽

Environmental Stability ◽

Color Temperature ◽

Ambient Atmosphere ◽

Light Emitting ◽

Halide Perovskite ◽

Lead Halide

All-inorganic lead halide perovskite (CsPbX3) nanocrystals (NCs) have emerged as a highly promising new generation of light emitters due to their extraordinary photophysical properties. However, the performance of these semiconducting NCs is undermined due to the inherent toxicity of lead and long-term environmental stability. Here, we report the addition of B-site cation and X-site anion (pseudo-halide) concurrently using Ba(SCN)2 (≤50%) in CsPbX3 NCs to reduce the lead and improve the photophysical properties and stability. The as-grown particles demonstrated an analogous structure with an almost identical lattice constant and a fluctuation of particle size without altering the morphology of particles. Photoluminescence quantum yield is enhanced up to near unity (~98%) by taking advantage of concomitant doping at the B- and X-site of the structure. Benefitted from the defect reductions and stronger bonding interaction between Pb2+ and SCN− ions, Ba(SCN)2-based NCs exhibit improved stability towards air and moisture compared to the host NCs. The doped NCs retain higher PLQY (as high as seven times) compared to the host NCs) when stored in an ambient atmosphere for more than 176 days. A novel 3D-printed multiplex color conversion layer was used to fabricate a white light-emitting diode (LED). The obtained white light shows a correlated color temperature of 6764 K, a color rendering index of 87, and luminous efficacy of radiation of 333 lm/W. In summary, this work proposes a facile route to treat sensitive lead halide perovskite NCs and to fabricate LEDs by using a low-cost large-scale 3-D printing method, which would serve as a foundation for fabricating high-quality optoelectronic devices for near future lighting technologies.

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