Copper tungsten alloy (W-Cu) is the pseudo-alloy of tungsten and copper, which exhibits some excellent properties such as a high melt point of 3042℃.  Owing to its good thermal and electrical conductivity, low thermal expansion, being non-magnetic, good performance under high temperature and vacuum. It has been widely applied in industry such as electrodes for resistance welding, arc contacts and vacuum contacts in high/medium voltage breakers or vacuum interrupters, electrodes in electric spark erosion cutting machines, heat sinks and heat spreaders for passive cooling of electronic devices, electronic packaging materials, and radio base station components

low thermal expansion, high hardness, low fracture toughness, excellent chemical stability and high melting point of the tungsten carbide-WC ceramic phase, along with excellent toughness properties in the ductile phase of the binding metal (Co, Ni, Ti or Fe), making it indispensable in applications in cutting tool industries and in drilling, drawing, extrusion, machining and forging processes.

White light LED (WLED) have been widely used in various lighting and display products in the market. Conventionally, WLED functions by applying InGaN blue LED chips with Ce3+:YAG yellow phosphor. However, there is a shortage of color purity owing to the absence of red component in its light emission.

Several studies reported that modifying CuO with CuWO4 can increase its photoactivity. Sodium tungstate dihydrate (Na2WO4·2H2O) is the most commonly-used metal salt precursor for tungsten, whereas compounds such as ammonium paratungstate (APT) have rarely been explored.