Synthesis of K2SiF6:Mn4+ phosphor for LED lamp

Retracted Article: Highly Stable Mn4+-Activated Red-Emitting Fluoride Phosphors and Enhanced moisture stability for White LEDs

“…The nearultraviolet excitation peak at about 360 nm and the blue excitation peak at about 468 nm can be observed in the PLE spectra. They are derived from Mn 4+ and in the transitions of 4 A 2 → 4 T 1 and 4 A 2 → 4 T 2 .The strongest excitation peak is located in the blue region, which can be well matched with the blue chip. Under the blue light's excitation of 468 nm, the strongest narrow-band emission peak of the sample is located at 632 nm, coming from the parity forbidden and spin forbidden transition of Mn 4+ from the low excited state 2 E 2 (t 2 3 ) energy level to the ground state 4 A 2 (t 2 3 ) energy level, which is sensitively visible light by the human eye.…”

“…Phosphor-converted white light-emitting diodes (pc-WLEDs) are considered as a new generation of green lighting sources. On account of its excellent properties such as energy saving, long service life, and environmental protection, it is universally acknowledged that it's used in indoor and outdoor lighting and liquid crystal display (LCD) backlight sources [1][2][3][4] . Phosphors, as one of the core materials of pc-WLEDs, play a significant role on the color-rendering index (CRI), correlated color temperature (CCT), and lumen efficiency of pc-WLEDs (Luminous efficiency, LE) and other optical quality parameters [5][6][7][8] .…”