Temperature dependent electrical properties of organic light-emitting diodes using a Zn complex

Area of Science:

• Materials Science
• Organic Electronics
• Solid State Physics

Background:

• Electroluminescent materials are crucial for organic light-emitting diodes (OLEDs).
• Understanding charge transport mechanisms in OLEDs is essential for device optimization.
• The material [(1,10-phenanthroline)(8-hydroxyquinoline)] Zn(phen)q is a novel synthesized compound for potential OLED applications.

Purpose of the Study:

• To synthesize and characterize a new electroluminescent material, Zn(phen)q.
• To investigate the temperature dependence of electrical properties in OLEDs utilizing Zn(phen)q.
• To elucidate the electrical conduction mechanism within the Zn(phen)q material.

Main Methods:

• Synthesis of the novel electroluminescent material [(1,10-phenanthroline)(8-hydroxyquinoline)] Zn(phen)q.
• Fabrication of organic light-emitting diodes (OLEDs) incorporating the Zn(phen)q material.
• Measurement of current density-voltage characteristics across a temperature range (60–240 K).
• Analysis of electrical properties using a hopping model with an exponential trap distribution.

Main Results:

• The synthesized material is identified as [(1,10-phenanthroline)(8-hydroxyquinoline)] Zn(phen)q.
• Electrical properties of OLEDs using Zn(phen)q were measured as a function of temperature.
• Hopping conduction with an exponential trap distribution was found to be dominant above 150 K.
• A characteristic trap depth of E(t) = 0.13 eV was determined.

Conclusions:

• The electrical conduction mechanism in OLEDs with Zn(phen)q is primarily governed by hopping conduction at temperatures above 150 K.
• The material exhibits a characteristic trap depth of 0.13 eV, providing insight into its charge transport properties.
• This study contributes to the understanding of novel electroluminescent materials for organic electronic devices.