Energy transfer induced color tunable photoluminescence in Tb3+/Sm3+ co-doped Y2O3 nano-phosphor for warm white LEDs

Effect of Cr3+ doping on structural and optical properties of Eu3+ doped LaVO4 phosphor

“…We have also monitored the absorption spectra of the samples in Kubelka–Munk (KM) mode to determine the optical band gap of LaVO 4 and its dependence on different doping concentrations of Cr 3+ ions. The Kubelka–Munk (KM) function is given as: 39–42 where, R ∞ represents the diffuse reflectance intensity of the samples normalized to the non-absorbing standard samples. The KM function F ( R ) is related to the band gap ( E g ) as:…”

“…In order to nd out different crystal structure parameters, Rietveld structural analysis of the XRD patterns of all the phosphors have been carried out by the use of FullProf Suite. 39,40 In the course of Rietveld structural analysis, we had supposed that the Eu 3+ and/or Cr 3+ ions are substituting at La-site in the LaVO 4 host. In the monoclinic crystal structure having P2 1 /n space group, V 5+ , La 3+ /Eu 3+ /Cr 3+ , O 2− (I), O 2− (II), O 2− (III) and O 2− (IV) ions substitute at 4e site (dx, dy, dz).…”

“…[17][18][19][32][33][34] We have also monitored the absorption spectra of the samples in Kubelka-Munk (KM) mode to determine the optical band gap of LaVO 4 and its dependence on different doping concentrations of Cr 3+ ions. The Kubelka-Munk (KM) function is given as: [39][40][41][42]…”

“…The value of m is taken 1 2 supposing the case to be of direct optical band gap. [39][40][41][42] Therefore,…”

Thermally stable Sm3+‐doped alkali zinc alumino borosilicate (AZABS) glass for warm white light generation and w‐LED applications

“…[37] Samarium ion (Sm 3+ )-based materials find usage in many modern day applications of display devices, SSL and lasers, therapeutic research, optical communications, etc. [19,20,[38][39][40][41] The Sm 3+ -doped materials give out sharp reddish orange luminescence due to three sharp transitions corresponding to 4 G 5/2 ! 6 H 5/2 , 4 G 5/2 !…”