A Non‐rare‐Earth Ions Self‐Activated White Emitting Phosphor under Single Excitation

Abstract

White light phosphors have many potential applications such as solid‐state lighting, full color displays, light source for plant growth, and crop improvement. However, most of these phosphors are rare‐earth‐based materials which are costly and would be facing the challenge of resource issue due to the extremely low abundance of these elements on earth. A new white color composite consisted of a graphitic‐phase nitrogen carbon (g‐C3N4) treated with nitric acid and copper‐cysteamine Cu3Cl(SR)2 is reported herein. Under a single wavelength excitation at 365 nm, these two materials show a strong blue and red luminescence, respectively. It is interesting to find that the white light emission with a quantum yield of 20% can be obtained by mixing these two self‐activated luminescent materials at the weight ratio of 1:1.67. Using a 365 nm near‐ultraviolet chip for excitation, the composite produces a white light‐emitting diode that exhibits an excellent color rendering index of 94.3. These white‐emitting materials are environment friendly, easy to synthesize, and cost‐effective. More importantly, this will potentially eliminate the challenge of rare earth resources. Furthermore, a single chip is used for excitation instead of a multichip, which can greatly reduce the cost of the devices.

Raman spectroscopy analysis of new copper‐cysteamine photosensitizer

“…As discussed by Ma et al, Cu‐Cy nanoparticles are different from other nanoparticle radiosensitizers because of the fact that Cu‐Cy can be activated not only by light but also by X‐rays, microwaves, and ultrasound to generate reactive oxygen species. In a related work, Dai et al have discussed fabrication of tunable warm white emission light emitting diode by using Cu‐Cy complex . Although, the microstructure and optical properties of this new Cu‐Cy complex have been studied in some details by using scanning electron microscopy (SEM), transmission electron microscopy, X‐ray Diffraction (XRD), and photoluminescence measurements, to our knowledge, the nature of the bonds between the various building elements has not been studied.…”

3D Foam Strutted Graphene Carbon Nitride with Highly Stable Optoelectronic Properties

“…Comparing to the TiO 2 and other oxide semiconductor suffered from moderate performance for their wide bandgap and low photocatalytic activity, graphite carbon nitride (g‐C 3 N 4 ) has attracted considerable attention due to its excellent optoelectronic properties . As an outstanding representative of 2D semiconductor, g‐C 3 N 4 endowed with many merits, such as excellent chemical and thermal stability, medium bandgap, and suitable redox potential etc., which enable it to have huge potential in various photocatalytic reaction, for instance, Friedel‐crafts reactions, oxygen reduction reaction, and water splitting, etc. However, bulk g‐C 3 N 4 obtained via the normal thermal condensation with 2D stacked layers suffered from the low surface specific area (SSA) and quick recombination of photoinduced carriers, which would hamper its photocatalytic performance to a large extent.…”

Come to light: Detailed analysis of thermally treated Phenyl modified Carbon Nitride Polymorphs for bright phosphors in lighting applications

“…Since 2014, an increasing attention has been devoted to graphitic Carbon Nitride (g-C 3 N 4 ) defined as one of most reliable photocatalysts for artificial photosynthesis and pollution degradation [7]. It was indicated as a very promising material for photovoltaic applications [8], a very efficient phosphor for lighting applications, [9,10] and lastly as a suitable photocatalysts for hydrogen generation, [11] and water splitting [12].…”