A novel K3WO2F5·2H2O:Mn4+ phosphor with excellent hydrophobic stability by coating paraffin wax for the application of WLEDs
Novel narrow-band red-emitting K 3 WO 2 F 5 ·2H 2 O:Mn 4+ and its paraffin wax (PW)-coated phosphor (K 3 WO 2 F 5 ·2H 2 O:Mn 4+ @PW) were synthesized via simple co-precipitation method. Optical properties of the phosphors have been systematically analyzed. Meanwhile, the energy transfer process in the phosphor was discussed in detail, which provides a feasible basis for broadening the application range of the phosphor when excited by UV-light. The thermostability of K 3 WO 2 F 5 ·2H 2 O:Mn 4+ sample was analyzed via investigating the temperature-dependent photoluminescence properties. More importantly, the luminescence properties and hydrophobic stability of the phosphors coated with PW were superior to those of K 3 WO 2 F 5 ·2H 2 O:Mn 4+ and K 2 SiF 6 :Mn 4+ . The luminescence intensity of K 3 WO 2 F 5 ·2H 2 O:Mn 4+ @PW decreased by only 24.5% after the phosphor was immersed in water for 360 min. K 3 WO 2 F 5 ·2H 2 O:Mn 4+ @PW was used as red component to fabricate the warm white light-emitting diode, which presents excellent photoelectric parameters Ra = 90.1 and CCT = 3664 K) and remarkable stability in the range of 20–200 mA driving current. These results demonstrated that K 3 WO 2 F 5 ·2H 2 O:Mn 4+ @PW red composition has the ideal application value in WLEDs.
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