Within Mn-activated phosphors, the oxidation state of Mn dopant strongly depends on the structural features of the host lattice. This paper reported a new polymorph of CsMg(PO 3 ) 3 (CMP) with a complicated three-dimensional (3D) framework of [Mg(PO 3 ) 3 ] ∞ that is constructed by MgO 6 octahedra and 1D infinite [PO 3 ] ∞ chains. Then we prepared a series of red phosphors CsMg 1−x (PO 3 ) 3 :xMn 2+ (CMP:xMn 2+ ) by high temperature solid state reactions in the open air. Powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) studies revealed the single Mn 2+ -oxidation. Under 404 nm light exciting, CMP:0.2Mn 2+ can emit single-band emission at around 630 nm with full-width at half-maximum (fwhm) of 70 nm. Besides, CMP:0.2Mn 2+ possesses excellent thermostability up to 450 K. These features indicate that CMP:0.2Mn 2+ is suitable to be used for LED backlight display. Moreover, this work suggests that a host lattice with suitable structure feature can form single Mn 2+ -oxidation and is rigid enough to protect Mn 2+ from being oxidized by O 2 at high temperature.

For Mn-activated phosphors, the luminescent performance is strongly dependent on the oxidation state of Mn. In this paper, a series of red phosphors NaMg(PO3)3:xMn2+ (NMP:xMn2+) were synthesized by high temperature...

The Eu2+ ion, with the 4f75d1 electronic configuration, is one of the most important activated ions for its symmetry-allowed 4f→5d electron transition. Herein, we successfully prepared a new type of...

Bi3+/Eu3+ co-doped phosphors can realize multi-color luminescence by adjusting the concentration ratio, which makes it possible to manually control the emission color. On this basis, a series of Bi3+/Eu3+ co-doped...

Recently, the growing demand for temperature detection is pushing forward the flourishing development of noncontact optical thermometry. Herein, a new red phosphor Sr 2 InTa 1−x O 6 :xMn 4+ (SIT:xMn 4+ ) was first constructed and systematically investigated. Based on the fairly rapid decline of the lifetime from 0.403 to 0.008 ms by increasing the temperature from 25 to 450 K, a noncontact optical thermometer can be made from phosphor SIT:0.003Mn 4+ with S r = 1.396% K −1 at 375 K and S a = 0.0012 K −1 at 300 K. Because the luminescence is based on the outermost 3d orbits of Mn 4+ , the lifetime of SIT:xMn 4+ is quite sensitive to the temperature, leading to a rapid decline of the lifetime with the increase in temperature. Moreover, multiple rounds of variable-temperature studies were performed to demonstrate the stability and reversibility of SIT:0.003Mn 4+ . This work suggests that Mn 4+phosphors are promising candidates for application as optical thermometric material.