A series of controllable emissions SrWO4 :Eu3+ and charge-compensated SrWO4 : Eum3+ (m = 0.01 or 0.20) phosphors was successfully prepared via a simple co-precipitation method. The energy transfer mechanism was studied based on the Huang's theory. A low magnitude of Huang-Rhys factor (10-2 ) was calculated using phonon sideband spectra. The Judd-Ofelt parameters Ωλ (λ = 2, 4 and 6) of Eu3+ -activated SrWO4 doped with charge compensation were obtained. The calculated Commission Internationale de l'Eclairage chromaticity coordinates were found to be about (0.67, 0.33) for SrWO4 : Eu0.203+ and charge-compensated SrWO4 : Eu0.203+ phosphors, which coincided with the National Television Standard Committee system standard values for red. A white light emission was obtained under 362 nm excitation. The correlated color temperature was computed by a simple equation to characterize light sources. Thus, warm white light-emitting diodes with higher Ra can be constructed by combining as-prepared high efficiency, low correlated color temperature and high color purity phosphor.

作者：Y D, Ren；Y H, Liu；S M, Tan；H Y, Cui；Y L, Wang；X M, Li；R, Yang；X, Wei；H W, Zhang；Y D, Sun

来源：Luminescence : the journal of biological and chemical luminescence 2016 年