Effect of substituent groups of porphyrins on the electroluminescent properties of porphyrin‐doped OLED devices

Abstract

Six tetraphenylporphyrins (TRPPH2) with different horizontal substituents R (R = H, CH3, OH, F, Cl, Br) were synthesized, and the organic light‐emitting diode (OLED) devices with a general configuration of ITO/TPD/Alq3:2%TRPPH2/Alq3/Al were prepared. The substituted TRPPH2 was used as the host dopant, 4,4‐bis‐(m‐tolyphenylamino)biphenyl (TPD) was used as a hole‐transporting material, and aluminum tris(8‐quinolinolato) (Alq3) was used as an electron‐transporting material. The electroluminescent (EL) properties of these devices were studied to understand the light emitting properties of the substituted TRPPH2. Previous studies have found that the color emitted by the devices was dependent on the TRPPH2 dye concentration. The electronic effect of the horizontal substituents R of TRPPH2 influenced the turn‐on voltage, brightness, and power efficiency of the devices. Also, the electroluminescence performance of the porphyrin‐doped OLED devices depended on the effectual overlaps between the emission of electron‐transporting material and the absorption of the dopants. This means that it is possible to evaluate the electroluminescence performance of the porphyrin‐doped OLED devices based on the emission of electron‐transporting material and the absorption of the dopants. Copyright © 2009 John Wiley & Sons, Ltd.

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

“…Several studies use porphyrin as a dopant, in which they increased the number of layers, and the device performance depended on the effective overlap of energy transfer from the electron carrier (host) to the dopant (guest). Therefore, it is important to highlight that in this study, the porphyrins were not used as dopants, and that they showed an electroluminescence in the red and a threshold voltage, which is similar to that reported in other works involving porphyrins as an emitter layer [8,9,14,15,46,47].…”

Interfacial Reactions of Tetraphenylporphyrin with Cobalt‐Oxide Thin Films

“…Furthermore, different chemical functionalities can be incorporated into the periphery of the macrocycle serving, for instance, as anchoring groups on different substrates. Porphyrin molecules attached to solid surfaces are therefore relevant for molecular devices including gas sensors, organic light‐emitting devices, catalysts and photovoltaic cells . In many of these systems, the porphyrin molecules are attached to oxide substrates, which makes fundamental studies on the adsorption and interaction of porphyrin molecules with oxide surfaces important.…”

Tetraferrocenylporphyrins as active components of self-assembled monolayers on gold surface

“…1 Because of their unique optical properties, porphyrins can be employed as sensitizers for photovoltaic 2 nanoscale devices, sensors 3 or as components of organic light emitting diodes. 4 Furthermore, porphyrins possess easily accessible and stable cationic and anionic states that can be exploited in the construction of molecular wires, 5 transistors 6 and molecular memories. 7 The introduction of redox-active substituents such as ferrocene in the meso or b-pyrrolic position results in additional redox processes thus extending their applicative potentiality.…”