Novel Na⁺ doped Alq₃ hybrid materials for organic light‐emitting diode (OLED) devices and flat panel displays

Abstract

Pure and Na(+) -doped Alq3 complexes were synthesized by a simple precipitation method at room temperature, maintaining a stoichiometric ratio. These complexes were characterized by X-ray diffraction, Fourier transform infrared (FTIR), UV/Vis absorption and photoluminescence (PL) spectra. The X-ray diffractogram exhibits well-resolved peaks, revealing the crystalline nature of the synthesized complexes, FTIR confirms the molecular structure and the completion of quinoline ring formation in the metal complex. UV/Vis absorption and PL spectra of sodium-doped Alq3 complexes exhibit high emission intensity in comparison with Alq3 phosphor, proving that when doped in Alq3 , Na(+) enhances PL emission intensity. The excitation spectra of the synthesized complexes lie in the range 242-457 nm when weak shoulders are also considered. Because the sharp excitation peak falls in the blue region of visible radiation, the complexes can be employed for blue chip excitation. The emission wavelength of all the synthesized complexes lies in the bluish green/green region ranging between 485 and 531 nm. The intensity of the emission wavelength was found to be elevated when Na(+) is doped into Alq3 . Because both the excitation and emission wavelengths fall in the visible region of electromagnetic radiation, these phosphors can also be employed to improve the power conversion efficiency of photovoltaic cells by using the solar spectral conversion principle. Thus, the synthesized phosphors can be used as bluish green/green light-emitting phosphors for organic light-emitting diodes, flat panel displays, solid-state lighting technology - a step towards the desire to reduce energy consumption and generate pollution free light.

Persistent phosphors for luminous paints: A review

“…Research speaks volumes on novel complexes of doped quinoline complexes that emit light in various regions of the visible spectrum. [ 64–67 ]…”

Influence of Fe3+ on Photophysical Properties of Alq3 Organic Nano Phosphors for Organic Light-Emitting Devices

“…Hence it is proposed to synthesize and characterize iron doped Alq 3 , which is generally used as electron transport or emission layer iron doped Alq 3 . The main focus of OLED investigation has been to address this issue to conjugate organic polymer as aluminum tri hydroxyl quinoline (Alq 3 ) [14][15][16][17]. An attempt is made to increase the performance, lifetime and temperature stability of the luminescent materials for OLEDs, solid state lightning, PLLCD.…”

Yellow Emissive Tris(8-hydroxyquinoline) Aluminum by the Incorporation of ZnO Quantum Dots for OLED Applications

“…Many researchers have proposed the use of hybrid (organometallic/inorganic) composites to overcome these issues. Besides, those hybrids showed significant improvements in mechanical strength, thermal stability, luminescent efficiency, and charge mobility when compared to pure Alq3 [ 15 , 16 ]. Cuba et al [ 17 ] showed that Alq3-ZnO composites exhibited enhanced luminescence properties and a slight shift from green emission to greenish blue.…”