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In this work, a novel red-emitting oxyfluoride phosphor Na 2 NbOF 5 :Mn 4+ with an ultra-intense zero-phonon line (ZPL) was successfully synthesized by hydrothermal method. The phase composition and luminescent properties of Na 2 NbOF 5 :Mn 4+ were studied in detail. The photoluminescence excitation spectrum contains two intense excitation bands centered at 369 and 470 nm, which match well with commercial UV and blue light-emitting diode (LED) chips. When excited by 470 nm blue light, Na 2 NbOF 5 :Mn 4+ exhibits red light emission dominated by ZPL. Notably, the color purity of the Na 2 NbOF 5 :Mn 4+ red phosphor can reach 99.9%. Meanwhile, the Na 2 NbOF 5 :Mn 4+ phosphor has a shorter fluorescence decay time than commercial K 2 SiF 6 :Mn 4+ , which is conducive to fast switching of images in display applications. Profiting from the intense ZPL, white light-emitting diode (WLED) with high color rendering index of Ra = 86.2 and low correlated color temperature of T c = 3133 K is realized using yellow YAG:Ce 3+ and red Na 2 NbOF 5 :Mn 4+ phosphor. The WLED fabricated using CsPbBr 3 quantum dots (QDs) and red Na 2 NbOF 5 :Mn 4+ phosphor shows a wide color gamut of 127.56% NTSC (National Television Standard Committee). The results show that red-emitting Na 2 NbOF 5 :Mn 4+ phosphor has potential application prospects in WLED lighting and display backlight.

A Novel Red-Emitting Na2NbOF5:Mn4+ Phosphor with Ultrahigh Color Purity for Warm White Lighting and Wide-Gamut Backlight Displays