Room temperature vibrational photoluminescence and field emission of nanoscaled tris-(8-hydroxyquinoline) aluminum crystalline film

Abstract

The nanoscaled tris-͑8-hydroxyquinoline͒ aluminum (AlQ 3) crystalline film was synthesized by vapor condensation. It was stacked with nanometer-sized rods, approximately 100 nm wide and 1 m long, and had a surface roughness of about 100 nm. The vibronic progression with several separated peaks was observed in the photoluminescence spectrum at room temperature. It is attributed to the crystallinity of AlQ 3 and the coupling of vibrations of the individual ligands to the fluorescence transition. The emission current was also observed with a turn-on field of 12.0 V/m, and a current density of about 0.8 mA/cm 2 at 22 V/m. Therefore, the AlQ 3 crystalline film provides a choice for field emission.

Growth of N,N′-di(naphthalene-1-yl)-N,N′-diphenyl-benzidine dome structures

“…The properties of Alq have been more extensively studied than the properties of NPB, and the syntheses of different Alq nanostructures were reported recently. [4][5][6][7] Vapor condensation of Alq resulted in formation of nanoparticles, 4 nanoscaled crystalline film, 5 and nanowires and nanobelts. 6 In vapor condensation synthesis method, [4][5][6] Alq evaporated from a graphite boat condensed on a Si substrate placed under a liquid nitrogen trap.…”

“…[4][5][6][7] Vapor condensation of Alq resulted in formation of nanoparticles, 4 nanoscaled crystalline film, 5 and nanowires and nanobelts. 6 In vapor condensation synthesis method, [4][5][6] Alq evaporated from a graphite boat condensed on a Si substrate placed under a liquid nitrogen trap. It was proposed that the nanostructures were formed via collisions with Ar atoms in the carrier gas and rapid cooling at the substrate kept at liquid nitrogen temperature which prevented coalescence.…”

Alq3 Nanorods: Promising Building Blocks for Optical Devices

“…[21,22] But more recently, alongside the fast development of nanoscience and nanotechnology, increased effort was put into the controlled synthesis of Alq 3 nanostructures, particularly one-dimensional (1D) nanostructures, in order to find potential applications in nano-optoelectronic devices. [23][24][25][26] However, the majority of research in this area so far focused on field emission and electroluminescence of bulks of nanorods or nanowires for vacuum and OLED devices, [23][24][25][26] and most of the Alq 3 nanostructures used were synthesized by traditional vapor deposition based methods. [23][24][25] To the best of our knowledge, there has been no report on the optical and electronic properties of single Alq 3 nanorods or nanowires; and the vapor phase synthesis methods reported to date require relatively high temperatures.…”

“…[23][24][25][26] However, the majority of research in this area so far focused on field emission and electroluminescence of bulks of nanorods or nanowires for vacuum and OLED devices, [23][24][25][26] and most of the Alq 3 nanostructures used were synthesized by traditional vapor deposition based methods. [23][24][25] To the best of our knowledge, there has been no report on the optical and electronic properties of single Alq 3 nanorods or nanowires; and the vapor phase synthesis methods reported to date require relatively high temperatures. In this regard, the following two points were desirable and significant for our study: i) develop a facile solution based route for the fabrication of high-quality, one-dimensional Alq 3 nanostructures and ii) explore the optical and electronic properties of individual Alq 3 nanorods or nanowires.…”

Cadmium(II) (8‐Hydroxyquinoline) Chloride Nanowires: Synthesis, Characterization and Glucose‐Sensing Application

“…[5] In addition, Alq 3 nanostructures, such as nanowires, nanorods, and nanometer-scaled crystalline films, exhibited field emission with a relatively low turn-on voltage. [13][14][15] Currently, most research work has focused on the nanostructure of Alq 3 and Znq 2 . Only a few investigations of other metal 8-hydroxyquinoline nanostructures have been carried out, partly because it is not easy to synthesize a well-defined nanostructure.…”