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.

The Electroluminescent Devices Based on Benzoxazinone as Strong Fluorescent Material

2011 ◽  
Vol 380 ◽  
pp. 339-343 ◽  
Author(s):  
Hui Pang ◽  
Wen Guan Zhang ◽  
Sheng Min Zhao
Keyword(s):  
Energy Levels ◽  
Electroluminescent Devices ◽  
Light Emitting ◽  
Fluorescent Material ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Homo And Lumo ◽  
Green Fluorescent ◽  
Fluorescence Spectrometer ◽  
Homo And Lumo Energy

The yellow-green fluorescent material 2-[2-(p-toluenesulphonylamino)phenyl]-4H-3,1- benzoxazin-4-one (TSPAPB) was synthesized by anthranilic acid and p-toluenesulphonyl chloride. Strong photoluminescent peaks were nearly at 530 nm. The fluorescence lifetime of solid powder was measured to be 6.47 ns by transient fluorescence spectrometer. HOMO and LUMO energy levels were calculated -4.92 and -1.61 eV. The multilayer yellow-green organic light-emitting devices (OLED) ITO/NPB/TSPAPB/BCP/TPBi or Alq3/LiF/Al were fabricated. Device A and B exhibited emissions at 576 nm with current efficiencies (CE) of 1.09 and 0.86 cd/A. The yellow-green electroluminescent peaks of Device C and D were at ca. 588 nm with current efficiencies of 0.94 and 0.68 cd/A, respectively. The characteristics of devices demonstrated that TSPAPB was a yellow-green emitter suitable for OLEDs.

scholarly journals The Effect of Acceptor Structure on Emission Color Tuning in Organic Semiconductors with D–π–A–π–D Structures

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1179 ◽  
Author(s):  
Przemyslaw Ledwon ◽  
Gabriela Wiosna-Salyga ◽  
Marian Chapran ◽  
Radoslaw Motyka
Keyword(s):  
Organic Semiconductors ◽  
Fluorescence Spectra ◽  
Near Infrared ◽  
Energy Levels ◽  
Light Emitting ◽  
Emission Color ◽  
Donor Acceptor ◽  
Homo And Lumo ◽  
Emission Quenching ◽  
Homo And Lumo Energy

A series of novel donor–acceptor D–π–A–π–D compounds were synthesized and characterized in order to determine the influence of different acceptor units on their properties. The introduction of acceptor moieties had a direct impact on the HOMO and LUMO energy levels. Fluorescence spectra of compounds can be changed by the choice of an appropriate acceptor and were shifted from the green to the near-infrared part of spectra. Due to observed concentration induced emission quenching, the green exciplex type host was used to evaluate the potential of synthesized molecules as emitters in organic light emitting diodes (OLEDs).

scholarly journals Fluorescent Indolo[2,3-b]quinoxalin-2-yl)(Phenyl)methanone Dyes: Photophysical, Aie Activity, Electrochemical, and Theoretical Studies

2021 ◽  
Author(s):  
Deepali Kanekar ◽  
Sudhakar Dhanawade ◽  
Anand Jadhav ◽  
Mohmmed Ghadiyali ◽  
Sajeev Chacko ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Energy Levels ◽  
Potential Candidate ◽  
Good Thermal Stability ◽  
Td Dft ◽  
Solid Film ◽  
Donor Acceptor ◽  
Homo And Lumo ◽  
Photophysical Studies ◽  
Homo And Lumo Energy

Abstract Herein, we have synthesized four indolo[2,3-b]quinoxalin-2-yl)(phenyl)methanone derivatives 1−4 by cyclocondensation. The photophysical studies of dyes in various solvents and neat solid film exhibit typical electronic spectra with inbuilt intramolecular charge transfer (ICT) (λmax: 397‒490 nm) confirming donor-acceptor architecture. Herein, dyes fluoresce in the blue-orange region (λEmax: 435–614) on excitation at their ICT maxima in toluene, ethyl acetate, chloroform, DMSO, and neat solid film. 1 and 2 which exhibit good emission intensity in all mediums, were studied for aggregation-induced emission (AIE) effect. Electrochemical studies indicate 1−4 possess relatively low lying LUMO (‒3.65 to ‒3.98 eV) comparable to reported n-type/electron-transporting materials. The HOMO and LUMO energy levels in 1−4 were evaluated by DFT and TD-DFT calculations. TGA analysis shows 1−4 exhibit good thermal stability. The characteristic optoelectronic properties and thermal stability signify these dyes are potential candidate for their application in optoelectronics.

scholarly journals Three-phase electric power driven electoluminescent devices

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Junpeng Ji ◽  
Igor F. Perepichka ◽  
Junwu Bai ◽  
Dan Hu ◽  
Xiuru Xu ◽  
...  
Keyword(s):  
Electric Power ◽  
Power Supply ◽  
Single Phase ◽  
Light Emission ◽  
Electroluminescent Devices ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Three Phase ◽  
Coplanar Electrodes

AbstractCurrent power supply networks across the world are mostly based on three-phase electrical systems as an efficient and economical way for generation, transmission and distribution of electricity. Now, many electrically driven devices are relying on direct current or single-phase alternating current power supply that complicates utilization of three-phase power supply by requiring additional elements and costly switching mechanisms in the circuits. For example, light-emitting devices, which are now widely used for displays, solid-state lighting etc. typically operate with direct current power sources, although single-phase alternating current driven light-emitting devices have also gained significant attention in the recent years. Yet, light-emitting devices directly driven by a three-phase electric power has never been reported before. Benefiting from our precious work on coplanar electrodes structured light-emitting devices, in this article we demonstrate proof of a concept that light-emitting components can be driven by three-phase electric power without utilizing intricate back-end circuits and can compose state detection sensors and pixel units in a single device inspiring from three primary colors. Here we report a three-phase electric power driven electroluminescent devices fabricated featuring of flexibility and multi-functions. The design consists of three coplanar electrodes with dielectric layer(s) and light emission layer(s) coated on a top of input electrodes. It does not require transparent electrodes for electrical input and the light emission occurs when the top light-emitting layers are connected through a polar bridge. We demonstrate some applications of our three-phase electric power driven electroluminescent devices to realize pixel units, interactive rewritable displays and optical-output sensors. Furthermore, we also demonstrate the applicability of three-phase electrical power source to drive organic light-emitting devices with red, green and blue-emitting pixels and have shown high luminance (up to 6601 cd/m2) and current efficiency (up to 16.2 cd/A) from fabricated three-phase organic light-emitting devices. This novel geometry and driving method for electroluminescent devices is scalable and can be utilized even in a wider range of other types of light-emitting devices and special units.

The Red Electroluminescence of Iridium Complex at Different Concentrations and Host Materials

2014 ◽  
Vol 633-634 ◽  
pp. 94-97
Author(s):  
Wen Guan Zhang ◽  
Lian Qin ◽  
Sheng Min Zhao
Keyword(s):  
Energy Levels ◽  
Iridium Complex ◽  
Guest Complex ◽  
Casting Technique ◽  
Spin Casting ◽  
Host Materials ◽  
Solid Film ◽  
Homo And Lumo ◽  
The Given ◽  
Homo And Lumo Energy

Six devices based on tris [2-(benzo [b] thiophen-2-yl) pyridinato-C3,N] iridium Ir (btpy)3 at the different concentration (0.5, 2, 8 and 12 wt. %) and in three host materials (PVK blending with PBD, PVK and CBP) were fabricated by spin-casting technique. The PL emission of Ir (btpy)3 in solid film peaked at 594 nm. HOMO and LUMO energy levels were-5.08 and-2.67 eV. The EL peaks kept constant at 600 and 649 nm, and Commission International de L′Eclairage (CIE) coordinates were stable at (0.63, 0.36). With the increasing of doping concentration luminances were enhanced at the given voltage. Devices of host PVK blending with PBD exhibited much higher luminance than device in host PVK or CBP at the same concentration of 8 %. All devices exhibited strong red electrophosphorescence. The transport of electron and hole was balanced and energy transfer from the host to the guest complex was efficient. The characteristics of devices demonstrated that Ir (btpy)3 was an excellent red emitter suitable for OLEDs.

A dibenzo[a,c]phenazine-11,12-dicarbonitrile (DBPzDCN) acceptor based thermally activated delayed fluorescent compound for efficient near-infrared electroluminescent devices

2018 ◽  
Vol 6 (25) ◽  
pp. 6698-6704 ◽  
Author(s):  
Shipan Wang ◽  
Yang Miao ◽  
Xianju Yan ◽  
Kaiqi Ye ◽  
Yue Wang
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Near Infrared ◽  
Light Emitting Diode ◽  
Fluorescent Compound ◽  
Electroluminescent Devices ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Thermally Activated ◽  
Organic Light

A high external quantum efficiency of 7.68% was achieved in a near-infrared organic light-emitting diode with a novel TADF molecule.

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