Metal nanocluster light-emitting devices with suppressed parasitic emission and improved efficiency: exploring the impact of photophysical properties

Nanoscale ◽  
2015 ◽  
Vol 7 (20) ◽  
pp. 9140-9146 ◽  
Author(s):  
T.-W. Koh ◽  
A. M. Hiszpanski ◽  
M. Sezen ◽  
A. Naim ◽  
T. Galfsky ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Energy Levels ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Metal Nanocluster ◽  
The Impact ◽  
Electrochemical Energy

Nanoclusters with different degrees of aggregation are synthesized and their electrochemical energy levels are measured to implement light-emitting devices with luminance >40 cd m−2 and EQE >0.1%, with suppressed parasitic emission.

Probing local photophysical properties in perovskite based light-emitting devices

2019 ◽  
Author(s):  
Miguel Anaya ◽  
Kyle Frohna ◽  
Linsong Cui ◽  
Javad Shamsi ◽  
Sam Stranks
Keyword(s):  
Photophysical Properties ◽  
Light Emitting ◽  
Light Emitting Devices

scholarly journals Exciton Coupling and Conformational Changes Impacting the Excited State Properties of Metal Organic Frameworks

Molecules ◽  
2020 ◽  
Vol 25 (18) ◽  
pp. 4230
Author(s):  
Andreas Windischbacher ◽  
Luca Steiner ◽  
Ritesh Haldar ◽  
Christof Wöll ◽  
Egbert Zojer ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Photophysical Properties ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Red Shift ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Exciton Coupling ◽  
Metal Organic ◽  
Crystalline Metal

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.

scholarly journals Characterization and Photophysical Properties of a Luminescent Aluminum Hydride Complex Supported by a β-Diketiminate Ligand

Inorganics ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 100 ◽  
Author(s):  
Shunichiro Ito ◽  
Kazuo Tanaka ◽  
Yoshiki Chujo
Keyword(s):  
Photophysical Properties ◽  
Aluminum Hydride ◽  
Molecular Vibration ◽  
Lithium Aluminum ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Theoretical Investigations ◽  
Aluminum Complexes ◽  
Aluminum Hydrides ◽  
Long Lifetime

Aluminum hydrides are versatile compounds utilized as reducing agents, precursors of aluminum complexes, and as catalysts for polymerization reactions. However, their photophysical properties have been overlooked, although several luminescent aluminum complexes have been utilized conventionally for emitting layers in modern light-emitting devices. Herein, we report the synthesis and photophysical properties of a luminescent β-diketiminate dihydride complex through the reaction between lithium aluminum hydride and the corresponding ligand. The obtained compound exhibits crystallization-induced emission (CIE) properties at room temperature and long-lifetime phosphorescence at 80 K. Our experimental and theoretical investigations suggest that low-energy molecular vibration could play an important role in the realization of the CIE property.

The impact of heteroatom substitution on cross-conjugation and its effect on the photovoltaic performance of DSSCs – a computational investigation of linear vs. cross-conjugated anchoring units

2018 ◽  
Vol 20 (35) ◽  
pp. 22660-22673 ◽  
Author(s):  
Mahalingavelar Paramasivam ◽  
Ramesh Kumar Chitumalla ◽  
Joonkyung Jang ◽  
Ji Ho Youk
Keyword(s):  
Photophysical Properties ◽  
Energy Levels ◽  
Photovoltaic Performance ◽  
Computational Investigation ◽  
Conjugated Systems ◽  
Reverse Trend ◽  
Heteroatom Substitution ◽  
The Impact

The heteroatom substitution on cross conjugation takes a reverse trend to the linear π-conjugated systems by means of energy levels and photophysical properties. The resultant changes directly affecting the photovoltaic performance of DSSCs.

scholarly journals Carbon Dots as A Sustainable New Platform for Organic Light Emitting Diode

2020 ◽  
Author(s):  
Paola Lagonegro ◽  
Umberto Giovanella ◽  
Mariacecilia Pasini
Keyword(s):  
Carbon Dots ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light Emitting Diode ◽  
Research Outcomes ◽  
Organic Light ◽  
The Impact ◽  
Organic Resources ◽  
Safe By Design

In the last 10 years, carbon dots (CDs) synthesized from renewable organic resources have been gathered a considerable amount of attention in different fields for their peculiar photoluminescent properties. Moreover, the synthesis of CDs fully responds to the principles of the circular chemistry and the concept of safe-by-design. This review will focus on the different strategies for the incorporation of CDs in organic light-emitting devices (OLEDs) and on the study of the impact of CDs properties on the OLEDs performance. The main current research outcomes and highlights are summarized to guide users towards the fully exploitation of use these materials in optoelectronic applications.

Thin Film Metal Nanocluster Light-Emitting Devices

2013 ◽  
Vol 26 (9) ◽  
pp. 1446-1449 ◽  
Author(s):  
Bjoern Niesen ◽  
Barry P. Rand
Keyword(s):  
Thin Film ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Metal Nanocluster

Design principles of carbazole/dibenzothiophene derivatives as host material in modern efficient organic light-emitting diodes

2017 ◽  
Vol 5 (28) ◽  
pp. 6989-6996 ◽  
Author(s):  
Junming Li ◽  
Shou-Cheng Dong ◽  
Andreas Opitz ◽  
Liang-Sheng Liao ◽  
Norbert Koch
Keyword(s):  
Carrier Transport ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Photophysical Properties ◽  
Energy Levels ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Host Materials

Host materials for modern high-efficiency organic light-emitting diodes (OLEDs) based on phosphorescence and thermally activated delayed fluorescence were optimized with respect to thermal stability, photophysical properties, energy levels, and charge carrier transport.

Non-Dopant Electroluminescent Devices Based on Benzoxazinone Derivative as Strong Fluorescence in Solid Film

2011 ◽  
Vol 399-401 ◽  
pp. 1151-1155 ◽  
Author(s):  
Hui Pang ◽  
Wen Guan Zhang ◽  
Sheng Min Zhao
Keyword(s):  
Energy Levels ◽  
Fluorescent Compound ◽  
Chlorobenzoic Acid ◽  
Electroluminescent Devices ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Solid Film ◽  
Homo And Lumo ◽  
Homo And Lumo Energy

The orange fluorescent compound 2-[2-(p-toluenesulphonylamino)-5-chlorophenyl]-6- chloro-4H-3,1-benzoxazin-4-one (Cl-TSB) was synthesized by reacting 2-amino-5-chlorobenzoic acid with p-toluenesulphonyl chloride. The strong photoluminescent peak was at 544 nm in solid film. HOMO and LUMO energy levels were calculated -5.00 and -1.82 eV. The multilayer organic light-emitting devices (OLEDs) ITO/NPB/Cl-TSB/BCP/TPBi or Alq3/LiF/Al were fabricated. The electroluminescent peaks of all devices were at ca. 620 nm with luminance of over 100 cd/m2. The characteristics of devices demonstrated that Cl-TSB was an orange emitter suitable for OLED.

Sign in / Sign up

Export Citation Format

Share Document