Journal of Inorganic Materials ›› 2016, Vol. 31 ›› Issue (6): 641-646.doi: 10.15541/jim20150562

• Orginal Article • Previous Articles     Next Articles

Synthesis and Optical Properties of Copper Doped Y2Ba2O5 Pigments with High Near-infrared Reflectance

Jun JIANG(), Bo-Long YAO(), Xv-Rui GAO, Li-Kui WANG, Hong-Ping LI, Li-Duo DENG   

  1. School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
  • Received:2015-11-17 Revised:2015-12-30 Online:2016-06-20 Published:2016-05-19
  • About author:JIANG Jun. E-mail:
  • Supported by:
    Natural Science Foundation of Jiangsu Province(BK20130144)


A series of environmentally benign near-infrared reflective green nano-pigments were synthesized via Sol-Gel method with a general formula of Y2Ba(2-x)CuxO5(x=0, 0.25, 0.50, 0.75 and 1.0). The crystal structure, morphology and optical properties of the synthesized pigments were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis-NIR diffuse reflectance spectra, and high accuracy spectrophotometer. Analysis results demonstrated that Cu ion was successfully introduced into the Y2Ba2O5 lattice of which grain size decreased from 62.1 nm to 54.7 nm. The systematic substitution of Cu2+ for Ba2+ in Y2Ba2O5 changed color from white to green (a*=-21.61) and decreased band gap from 2.30 eV to 2.04 eV. These pigment samples revealed the uniform spherical-like morphology with an average size of 150-300 nm. When Cu2+ was introduced, the infrared reflectance of pigment sample was decreased. However, the pigment still displayed high near infrared reflectance (68.80%) and solar reflectance (45.95%), while the doping of Cu2+ up to x=0.50. Therefore, such green high near-infrared reflectance from these Y2Ba(2-x)CuxO5 powders have great potential in serving as cool pigments for building coatings.

Key words: Sol-Gel, green pigment, near-infrared reflectance, band gap

CLC Number: 

  • TQ174