Light-Emitting Porphyrin Derivative Obtained from a Subproduct of the Cashew Nut Shell Liquid: A Promising Material for OLED Applications

Abstract

In this work, the meso-tetra[4-(2-(3-n-pentadecylphenoxy)ethoxy]phenylporphyrin (H2P), obtained from the cashew nut shell liquid (CNSL), and its zinc (ZnP) and copper (CuP) metallic complexes, were applied as emitting layers in organic light emitting diodes (OLEDs). These compounds were characterized via optical and electrochemical analysis and the electroluminescent properties of the device have been studied. We performed a cyclic voltammetry analysis to determine the Highest Occupied Molecular Orbital (HOMO) and Lowest Unoccupied Molecular Orbital (LUMO) energy levels for the porphyrins, in order to select the proper materials to assemble the device. H2P and ZnP presented fluorescence emission band in the red region, from 601 nm to 718 nm. Moreover, we verified that the introduction of bulky substituents hinders the π–π stacking, favoring the emission in the film. In addition, the strongest emitter, ZnP, presented a threshold voltage of 4 V and the maximum irradiance of 10 μW cm−2 with a current density (J) of 15 mA cm−2 at 10 V. The CuP complex showed to be a favorable material for the design of OLEDs in the infrared. These results suggest that the porphyrins derived from a renewable source, such as CNSL, is a promising material to be used in organic optoelectronic devices such as OLEDs.

Near‐Infrared Emission by Tuned Aggregation of a Porphyrin Compound in a Host–Guest Light‐Emitting Electrochemical Cell

“…Our observations from the emission studies suggest that Por4NT has a strong propensity for aggregation both in solution and in the solid-state. [40] This behavior is in agreement with the conformational DFT results depicted in Figure 2a, which revealed that Por4NT prefers to adopt a highly flat conformation in both the ground state and the excited state. Accordingly, we suggest that the aggregation of Por4NT takes the form of flat-on packing.…”

Carbon Nanodots as Electron Transport Materials in Organic Light Emitting Diodes and Solar Cells

“…As far as the spectrum of the F8BT emitter is concerned, the bands at 2930 cm −1 and 2850 cm −1 correspond to the stretching mode of the C–H bond, while the band at 1460 cm −1 is due to the C=C stretching mode of an aromatic group [ 31 , 32 ]. Furthermore, the stretching mode between the phenyl rings is detected at 1250 cm −1 , the deformation of aliphatic chain bonds at 1100 cm −1 and the C–H rocking mode at 812 cm −1 .…”

Enhancing the charge transport and luminescence properties of ethyl 4-[(E)-(2-hydroxy-4-methoxyphenyl)methyleneamino]benzoate through complexation: a DFT and TD-DFT study

“…[4][5][6][7] Their applications in displays are due to several unique advantages such as low cost, high contrast, good colour range, exibility, wide viewing angle, fast response time, low driving voltage, low weight, lowtemperature maintenance, and absence of toxic metals. 6,[8][9][10] In their mode of operation, OLED devices transform electrical energy into light. OLED materials encompass a sequential multilayer arrangement of thin organic lms (an emissive layer (EL), a hole-transport layer (HTL) and an electron transport layer (ETL)), all in the middle of two electrodes, assembled via a variety of high technologies.…”