NaF induced enhancement of luminous efficiency in narrow-band red-emitting K2TiF6:Mn4+@NaF phosphors
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A series of K2TiF6:xMn4+ @NaF samples were prepared by the cation exchange method in HF solution. Coating effects of NaF on the fluorescent properties of the samples were discussed. It is interesting that NaF has induced enhancement of luminous efficiency for the samples. Mechanism of NaF induced enhanced luminescence effect was suggested. That is that the enhancement effect of NaF coating is mainly attributed to a suitable local distortion of the crystal field surrounding the Mn4+ activator through doping with NaF. The results indicate that the optimal conditions are x = 0.07 and wNaNO3 = 2.5 g. Decay lifetime and the photoluminescence quantum yield of the optimal sample are 5.25 ms and 99.19 ± 0.03%, respectively. The chromaticity coordinates of the optimal sample are x = 0.6926, y = 0.3073. So, the phosphor emits deep red light, which can be applied for blue light-based white LED.
This research is supported by the National Natural Science Foundation of China (Grant Nos. 21561003, 21661006), the Scientific Research Foundation of Guangxi University (Grant No. XDZ140116), and the Students Experimental Skills and Innovation Ability Training Fund Project of Guangxi University (Nos. 201610593172, 201710593183).
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