Abstract
One new kind of red-emitting oxyfluoride phosphors Rb2WO2F4 doped with different Mn4+ contents were synthesized via a facile co-precipitation method at an ambient condition. Meanwhile, the luminescent behaviors of Mn4+ in Rb2WO2F4 were investigated in detail. The sample prepared with the WO3/K2MnF6 molar ratio of 40:1 has a broad excitation band around 465 nm and emits a series of sharp-emitting peaks around 631 nm. The crystal-field strength Dq as well as Racah parameters B and C were calculated to be 2151, 583 and 3872 cm−1, meaning that Mn4+ in Rb2WO2F4 experiences a strong crystal field. The luminescence decay time was also determined to be 2.15 ms. Finally, a warm white LED was obtained using Rb2WO2F4:Mn4+ as red component. It's color rendering index was improved to 81.4 and color temperature was decreased to 3588 K.
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