High efficiency and high color purity blue-emitting NaSrBO3:Ce3+ phosphor for near-UV light-emitting diodes

Tunable white light emissive Mg2SiO4:Dy3+ nanophosphor: Its photoluminescence, Judd–Ofelt and photocatalytic studies

“…Further, concentration quenching usually occurs as a result of non-radiative energy transfer among luminescent centers. Non-radiative energy transfer from one Dy 3+ to another Dy 3+ may take place via exchange interaction, radiative reabsorption or electric multipolar interaction[61]. The exchange interaction needs a large direct or indirect overlap between donor and acceptor, which was responsible for the energy transfer for forbidden transitions and shorter critical distances of less than 5 Ǻ[62][63][64][65].…”

Tunable photoluminescence properties of nano-sized Zr 1-x O 2 : x Dy 3+ phosphors

“…Therefore, the emission spectra are recorded under the excitation of 354 nm wavelength to optimize the Dy 3+ content. [25,26]. The exchange interaction needs a large direct or indirect overlap between donor and acceptor.…”

DFT calculation, electric and luminescent property of titanate solid state electrolytes based red emitting phosphor A 2 La 2 Ti 3 O 10 :Eu 3+ (A = Na, K)

“…For the Na 2 La 2 Ti 3 O 10 and K 2 La 2 Ti 3 O 10 hosts, V ¼ 419.96 Å 3 and 448.27 Å 3 , N ¼ 2 and X c is 0.5, thus the critical distance R c for energy transfer between the Eu 3þ ions in the A 2 La 2 Ti 3 O 10 was estimated to be 9.29 Å for A ¼ Na and 9.50 Å for A ¼ K. These calculated R c values are far beyond 5 Å, indicating the impossibility of exchange interaction [23], while the mechanism of radiation reabsorption is only efficient for the sample with significant overlap between the PL and PLE spectra. It can infer that electric multipolar interactions mechanism dominates energy transfer, and the type of multipolar interaction could be determined from Eq.…”