Morphology control of uniform CaMoO4 microarchitectures and development of white light emitting phosphors by Ln doping (Ln = Dy3+, Eu3+)

摘要

A very simple synthesis procedure based on precipitation reactions at moderate temperature (120 °C) from\udsolutions containing calcium nitrate and sodium molybdate, using mixed solvents (polyols and water) has\udbeen developed, which produces uniform tetragonal CaMoO4 microarchitectures with different morphologies\ud(peanuts, cocoons, spindles and spheres) composed of self-assembled entities. The morphology and\udcrystal size of such assemblies could be tuned by a simple change of the nature of the components of the\udsolvent mixture or their volumetric ratio in such a mixture. All particles presented similar excitation and\udemission spectra arising from a charge transfer process within the MoO4 groups. The emitted light\udpresented a bluish-green color and its intensity was higher for the spindle-type particles. This synthesis procedure\udwas also suitable for doping peanut-like CaMoO4 architectures with Eu3+ or Dy3+ cations up to a 1%\udmolar ratio (Ln/Ln + Ca), without altering their morphology or crystalline structure. The so prepared phosphors\udemitted an intense red (Eu-doped) or greenish (Dy-doped) light when excited through the MoO4\udgroup excitation band, indicating the presence of an energy transfer process from such groups to the Ln3+\udcations. Finally, a white light emitting phosphor with chromaticity coordinates x = 0.335 and y = 0.365 and\uda correlated color temperature of 5407 K was developed by codoping peanut-type CaMoO4 particles with\udsuitable amounts of Dy3+ (0.35%) and Eu3+ (0.15%) cations, which could find applications in white light emitting\uddiodes.