EPR and photoluminescence properties of combustion-synthesized ZnAl2O4:Cr3+ phosphors

Fabrication and luminescence properties of one-dimensional ZnAl2O4 and ZnAl2O4: A3+ (A=Cr, Eu, Tb) microfibers by electrospinning method

“…Beside the so-called R and N lines of the 2 E ! 4 A 2 transition of Cr 3+ ions, two broad bands centered at 430 nm and 600 nm were observed in our experiments [40,41]. The first band at lower wavelength can be attributed to the host.…”

“…The emission spectrum (right) under the excitation of 400 nm displayed several sharp and intense emission lines identified as socalled R and N lines of the 2 E ! 4 A 2 spin-forbidden transition of Cr 3+ ions [40,41]. The R line (689 nm) originates from transition 2 E !…”

Magnetic characterization of microcrystalline Na3Ln0.99–xEr0.01Crx(PO4)2 orthophosphates synthesized by Pechini method (Ln = La, Gd)

“…Isolated chromium ions give an EPR signal centred at g ∼ 2 (a large distortion in an axial symmetry can split the EPR signal shifting it towards lower magnetic fields, up to g ∼ 3.74 [35]), chromium pairs above g > 2, and, other ions pairs, such as Er 3+ -Na + or Cr 3+ -Na + below g < 2 [34]. The EPR signal of chromium ions with a spin of S = 3/2 is composed of three separate and narrow lines with relatively low intensity.…”

Extraction of Y2O3:Cr3+ nanophosphor by eco‐friendly approach and its suitability for white light‐emitting diode applications

“…Figure (a,b) shows the CIE chromaticity and supporting CCT diagram of Y 2 O 3 :Cr 3 + (0.5–9 mol%) respectively. The calculated CCT value of these nanophosphors is 4693 K, which corresponds to vertical daylight (5500–6000 K) . Therefore, the white light emitted from these nanophosphors can be useful for the artificial production of vertical sunlight.…”