Design of novel cyan phosphor Ca7NaLu(PO4)6:Eu2+ for full-visible-spectrum white LED: enhanced thermal stability and tuned emission by neighbor cation effect

Near-infrared Sr7NaGa(PO4)6:Cr3+,Ln3+ (Ln = Nd, Er, and Yb) phosphors with different energy transfer paths: photoluminescence enhancement and versatility

“…3d, all decay curves are fitted with a single exponential function, meaning that there is only one site for Cr 3+ to occupy in the host. The lifetimes of samples decrease with an increase in Cr 3+ -concentration, which can be explained using the formula given below: 38,39 where τ 0 stands for the radiative lifetime, A nr and P t represents the nonradiative rate depending on multiphonon relaxation and the energy transfer rate. On the basis of the equation, we know that the nonradiative rate increases with an increase in Cr 3+ -concentration, leading to an attenuation of the lifetimes.…”

Multiple site occupancy induced yellow-orange emission in an Eu2+-doped KSr6Sc(SiO4)4 phosphor towards optical temperature sensors

“…The emission of Eu 2+ ions is a result of the spin-allowed electronic transition from the excited state 4f 6 5d 1 to the ground state 4f 7 , which exhibits a broad spectrum of excitation and emission spectra. [14][15][16][17] Meanwhile, Eu 2+ ions have the feature of emitting an adjustable emission color in different host materials, which is due to their extreme sensitivity to the crystal structure of the matrix and the chemical composition of the local host lattice. [18][19][20] Therefore, Eu 2+ ions can launch various visible colors and invisible light by locally modifying host structures and compositions, such as the Li 2 CaSi 2 N 4 :Eu 2+ phosphor (orange emission), 21 BaMgAl 10 O 17 :Eu 2+ phosphor (blue emission), 22 RbBaScSi 3 O 9 :Eu 2+ phosphor (cyan emission), 23 Sr 3 SiO 5 :Eu 2+ phosphor (yellow emission), 24 Ba 3 Si 6 O 12 N 2 :Eu 2+ phosphor (green emission), 25 Sr[LiAl 3 N 4 ]:Eu 2+ phosphor (red emission), 26 and Ca 3 Sc 2 Si 3 O 12 :Eu 2+ phosphor (near-infrared emission).…”

Highly efficient blue‐emitting phosphor via charge compensation strategy and its application for white LED lighting

“…The typically WLEDs device is composed of blue InGaN chip, green‐yellow Lu/Ga‐YAG:Ce 3+ and red CaAlSiN 3 :Eu 2+ phosphors. But this approach exhibits a strong blue spike derived from unconverted blue light in the InGaN chip 6–8 . The blue spike disrupts the normal biological rhythm of the human body resulting in sickness, like circadian disruption and mood disorders 9–12 .…”

“…But this approach exhibits a strong blue spike derived from unconverted blue light in the InGaN chip. [6][7][8] The blue spike disrupts the normal biological rhythm of the human body resulting in sickness, like circadian disruption and mood disorders. [9][10][11][12] These problems can be solved by using the near-ultraviolet (n-UV) light pumped WLEDs consisting of red, green, and blue phosphors.…”