Synthesis and luminescence properties of novel Sr3Gd(PO4)3:Dy3+ phosphor

Emerging cool white light emission from Dy3+ doped single phase alkaline earth niobate phosphors for indoor lighting applications

“…Hence, it is necessary to calculate the critical distance (R c ) between the adjacent Dy 3+ ions. According to Blasse [45][46][47] the critical distance could be expressed as:…”

“…The exchange interaction is usually accountable for the energy transfer for the forbidden transition and the critical distance of about 5 Å. 47 Since, the distance between adjacent Dy 3+ ions is larger than 5 Å, as a result the exchange interaction becomes ineffective and multipolar interaction will become important in this case. According to Dexter's theory, when the doping amount of the activator is large enough, the luminescence intensity I and the mole fraction of activator ions x could be related as follows: 49,50 logðI=xÞ…”

Simultaneous accommodation of Dy3+ at the lattice site of β‐Ca3(PO4)2 and t‐ZrO2 mixtures: Structural stability, mechanical, optical, and magnetic features

“…The absorption spectra of β ‐Ca 3 (PO 4 ) 2 /ZrO 2 composites (Figure A) revealed major absorption bands pertaining to the f‐f electronic dipole transition of Dy 3+ . The peak positions and their corresponding electronic transition from 6 H 15/2 states of Dy 3+ are assigned as follows: 386 ( 4 M 21/2 ), 424 ( 4 I 13/2 ), 451 ( 4 I 15/2 ), 472 ( 4 F 9/2 ), 745 ( 6 F 1/2 ) + 757 ( 6 F 3/2 ), 798 ( 6 F 5/2 ), 905 ( 6 F 7/2 ), 1097 ( 6 F 9/2 ), 1281 ( 6 F 11/2 ) . Besides, the gradual surge in absorption intensity is evident as a function of enhanced Dy 3+ content in CPDZ compositions.…”

The Preparation and Optical Properties of Novel LiLa(MoO4)2:Sm3+,Eu3+ Red Phosphor

“…When the activator concentration, X, is large enough, there is relationship between the emission intensity I and the activator concentration x : I / x α [β( x ) θ/3 ] −1 or log( I / x ) = c − (θ/3)log x [52], where β is constant, and θ = 6, 8 or 10 corresponds to electric dipole-electric dipole, electric dipole-electric quadrupole or electric quadrupole-electric quadrupole interaction, respectively [52]. The emission spectra of LL 1− x M: x Sm 3+ were measured under 403 nm excitation and the curve $\lg false(I/xfalse)$ vs. $\lg x$ was fitted, as it is shown in Figure 3b.…”