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Title: Synthesis and characterization of greenish-blue light emitting lithium-boron complex for organic light emitting diode applications
Authors: Misra, Aparna
Kumar, Pankaj
Kumar, Lokendra Kumar
Dhawan, S K Dhawan
Kamalasanan, M N
Chandra, Subhas
Issue Date: Aug-2006
Publisher: CSIR
IPC CodeH01L 51/50
Abstract: A lithium-boron complex, lithium tetra (2-methyl 8-hydroxy quinolinato) boron (LiBqm4), which emits greenish-blue light has been synthesized by the reaction of LiBH4 with 2-methyl 8-hydroxyquinoline in a molecular weight ratio of 1:4, and used for organic light emitting diodes (OLEDs) fabrication. The complex has been characterized by optical absorption, Fourier Transform Infrared (FTIR), photoluminescence (PL) and electroluminescence (EL) spectroscopic methods. The thermo-gravimetric analysis (TGA) suggests that the material is quite thermally stable up to 380oC. An optical band gap of 3.15 eV using the well-known Tauc relation and an exciton binding energy of 0.69 eV has been evaluated. OLEDs have been fabricated in ITO/N,N′-di-(3-methyl-phenyl)-N,N′diphenyl-4,4′diaminobiphenyl(TPD)/LiBqm4/Al configuration. PL and EL peaks exist at 503 nm. I-V characteristic of device reveals that at higher voltages the current follows I Vm law, where m > 1.
Page(s): 357-361
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Source:IJEMS Vol.13(4) [August 2006]

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