A new zinc–Schiff base complex as an electroluminescent material

Abstract

A Schiff base bis(salicylidene)propylene-1,3-diamine (salpen) 2 and its complex with zinc metal as bis(salicylidene)propylene-1,3-diaminatozinc(II) [Zn(salpen) 2 ] were prepared and characterised by various spectral techniques. The zinc complex had high thermal stability (> 300 • C) as well as high glass transition temperature (> 150 • C). Optical properties of the metal complex were studied by UV-visible absorption and photoluminescence emission spectroscopy. Multilayered organic electroluminescent devices were fabricated with a structure ITO/α-NPD/Zinc(salpen) 2 /BCP/Alq 3 /LiF/Al, using the zinc complex as an emissive material. The electroluminescence peak emission was centred at 513 nm with colour chromaticity having Commission Internationale d'Eclairage (CIE) coordinates x = 0.26 and y = 0.50. A bright blue-green emission with a luminance of 1990 Cd/m 2 was recorded at 15 V as an optimum voltage.

Synthesis and characterization of a mononuclear zinc(ii) Schiff base complex: on the importance of C–H⋯π interactions

“…[65][66][67] The band at 356 nm may be attributed to the n / p* charge transfer transition. 68,69 There is no band corresponding to d-d electronic transitions, as expected for zinc(II) complexes with d 10 electronic conguration. 55 1 H NMR spectrum 1 H NMR Spectra of complex is shown in Fig.…”

Novel Zinc Complex with an Ethylenediamine Schiff Base for High-Luminance Blue Fluorescent OLED Applications

“…Actually, the present paper demonstrates for the first time the utilization of an Zn azomethin-zinc complex as emissive material to construct really efficient highluminance purely fluorescent blue OLEDs that many times surpasses the previously published analogues [69][70][71] (by one to two orders of magnitude for brightness, EQE, current and power efficiencies). Comparison between the lighting characteristics of the devices A and B, fabricated in this work with other previously published blue OLEDs based on the Schiff-base Zinc complexes is summarized in Table S5.…”

Efficient white polymer light-emitting diodes (WPLEDs) based on covalent-grafting of [Zn2(MP)3(OAc)] into PVK

“…Despite concerted efforts toward monochromatic (blue-, 11 green-, 12 yellow-, 13 orange- 14 or red-light 15 ) electroluminescent devices from Zn( ii )-complexes, their reliable panchromatic devices (WOLEDs/WPLEDs) greatly underperform. In this regard, benefiting from the volatility of most Zn( ii )-complexes, a vacuum-deposition procedure for their WOLEDs was employed.…”