A full-color emitting phosphor Ca 9 Ce(PO 4 ) 7 :Mn 2+ , Tb 3+ : Efficient energy transfer, stable thermal stability and high quantum efficiency

Full color white light, temperature self‐monitor, and thermochromatic effect of Cu+ and Tm3+ codoped germanate glasses

“…Notably, the color coordinates and CCT of GC0.40T0. 15 are derived to be (0.3221, 0.3179) and 6048 K, which are closer to the standard white light (x = 0.333, y = 0.333) with CCT = 5930 K, and the corresponding CRI value 87.6 proves that the white light emissions in the GC0.40T0.15 are promising for the application in solid state illumination. Additionally, with the increase of Tm 3+ co-doping concentration, the color coordinates of co-doped germanate glasses show a movement in the direction from the warm (0.3707, 0.3927) to cool white (0.2945, 0.2784) region due to the relative intensity enhancement of blue emission of Tm 3+ .…”

“…The latter displays low luminescent efficiency owing to strong fluorescence re‐absorption among different phosphors, large Stokes shifts, and inferior excitation efficiency of the phosphors under NUV excitation 9,10 . Consequently, the single‐component luminescent materials, which can directly generate tunable white light with full‐color emission, have drawn significant exploration interest to obtain high‐quality w‐LEDs in recent years because they can realize excellent fluorescence and chromatic performance 11‐16 …”

“…9,10 Consequently, the single-component luminescent materials, which can directly generate tunable white light with full-color emission, have drawn significant exploration interest to obtain high-quality w-LEDs in recent years because they can realize excellent fluorescence and chromatic performance. [11][12][13][14][15][16] It is well known that the luminescent properties of the phosphors are strongly dependent on the host materials and the optical activators. Germanate glass, one type of attractive optical host materials, has high solubility for rare earth (RE) and transition metal (TM) ions, relatively low phonon energy and good transparency that give rise to effective local-field effect for RE and TM ions.…”

Multicolor and Warm White Emissions with a High Color Rendering Index in a Tb3+/Eu3+-Codoped Phosphor Ceramic Plate

“…In spite of several works that show that Tb 3+ /Eu 3+ -codoped materials are good candidates for solid-state lighting applications, most of the published reports only present spectroscopic and structural properties. However, luminous efficacy, lighting properties, and device prototypes based in Tb 3+ /Eu 3+ -codoped material for solid-state lighting have been seldom reported [31]. In this work, the color tuning of a Tb 3+ /Eu 3+ ceramic phosphor plate as a function of Eu 3+ concentration has been investigated.…”

Synthesis and luminescence properties of single‐component Ca5(PO4)3F:Dy3+, Eu3+ white‐emitting phosphors

“…Therefore, it is necessary to investigate a single‐component white‐emitting phosphor with near‐ultraviolet (n‐UV) excitation. Until now, many single‐component white‐emitting phosphors have been reported, such as Eu 2+ –Mn 2+ , Mn 2+ –Tb 3+ , Ce 3+ –Tb 3+ , Eu 2+ –Eu 3+ co‐doped silicates, phosphates, etc . In addition to using such doped systems, white light can also be acquired by combining the two intense emission bands in the blue (~480 nm) and yellow regions (~580 nm) of Dy 3+ ions .…”