Donor doping process and white light generation in CaMoO4 powders with multivalence Pr codoping

Both trivalent praseodymium (Pr3+) and quadrivalent praseodymium (Pr4+) were doped in molybdate powders. Visible emission from matrix was enhanced by multivalent Pr codoping. It was proposed that Pr3+ ions was donor and supplied quasi-free electron when Pr3+ took place the Pr4+ sites. The result showed that multivalence codoping would be an effective way to enhance emission of CaMoO4. White light can be generated from Ca0.98Pr0.02MoO4 powder via combination of broadband emissions originated from CaMoO4 matrix and radiative transition of Pr3+. It showed warm white light with Tc of 3450 K that implies promising application in white light emitting diodes (LEDs).