Fabrication and Investigation of Two-Component Film of 2,5-Diphenyloxazole and Octafluoronaphthalene Exhibiting Tunable Blue/Bluish Violet Fluorescence Based on Low Vacuum Physical Vapor Deposition Method

Abstract

Organic luminescent materials play an important role in the fields of light-emitting diodes and fluorescent imaging. Moreover, new synthetic approaches towardsπ-conjugated molecular systems with high fluorescence quantum efficiency are highly desired. Herein, different 2,5-diphenyloxazole-octafluoronaphthalene (DPO-OFN) films with tunable fluorescence have been prepared by Low Vacuum Physical Vapor Deposition (LVPVD) method. DPO-OFN films showed some changed properties, such as molecular vibration and fluorescence. All films exhibited blue/bluish violet fluorescence and showed blue shift, in comparison with pristine DPO. This work introduced a new method to fabricate two-component molecular materials with tunable blue/bluish violet luminescence properties and provided a new perspective to prepare organic luminescent film materials, layer film materials, cocrystal materials, and cocrystal film materials. Importantly, these materials have potential applications in the fields of next generation of photofunctional materials.

Organic luminescent crystals: role of packing structures and optical properties

“…The mechanical grinding produces anisotropic force, which destroys the long-range ordered structures in the crystal to form microcrystal and amorphous phases. [69][70][71][72] Meanwhile, the diamond anvil cell device can control the hydrostatic pressure through mutual compression by two diamond anvil surfaces to tune the lattice parameter in the crystal. The essential differences between these two external force forms can induce different piezochromic effects.…”

Crystal Structures, Photoluminescence, and Magnetism of Two Novel Transition-Metal Complex Cocrystals with Three-Dimensional H-Bonding Organic Framework or Alternating Noncovalent Anionic and Cationic Layers

“…Meanwhile, the cocrystallization process does not affect the chemical integrity of molecule compounds. − Pharmaceutical cocrystals, formed between an active pharmaceutical ingredient (API) and a cocrystal precursor that is a solid under ambient conditions, represent a new paradigm in API formulation that might address important intellectual and physical property issues in the context of drug development and delivery . In other material science, the cocrystal of two different molecules is a possible way of intentionally influencing the position of molecules in a crystal lattice and allows for the investigation of newly generated macroscopic properties. − It has been known that the material properties, including magnetism, photoluminescence, ,− mechanical strength, etc., are modifiable using a cocrystallization strategy, and the desired physical and chemical properties are delivered by means of selecting a suitable cocrystal precursor to form a cocrystal with the active compound …”

Fabrication and Investigation of 26NCA Films Exhibiting Tunable Blue Fluorescence Based on LVPVDM

“…However, little attention has been focused on the tunable fluorescence of micro/nanostructured single/twocomponent metallic/organic fluorescent films, which are expected to be used in large-scale flat panel display [29]. Octafluoronaphthalene (OFN) crystal has one maximum emission ( em max ) at 353 nm, which is different from the one of 26NCA; thus 26NCA/OFN layer film is expected to present multicolor luminescence and even be used in soft optical device [29,41].…”