Concentration quenching of fluorescence from 1D2 state of Pr3+ in YPO4

Dynamics of the excitation and upconversion processes in YAlO3: Pr single crystals

“…This behavior is likely due to a crossrelaxation process that leads to quenching of luminescence from the 1 D 2 level. As reported by others [18][19][20], the likely path of this cross-relaxation path is: 1 D 2 + 3 H 4 -1 G 4 + 3 F 3 . We note that as the temperature is increased, the lifetime becomes shorter, the nonexponential component of the decay curve becomes more prominent, and the emission intensity decreases with the lifetime (Fig.…”

“…From 1 D 2 there are several mechanisms through which the system is known to decay: radiative, cross-relaxation between Pr ions, multiphonon decay, and upconversion. The cross-relaxation process is known to seriously quench the 1 D 2 luminescence in some systems [18][19][20][21]. This quenching can be deleterious for the upconversion process as well, since it depletes the population of the 1 D 2 level.…”

Dependence of cross-relaxation on temperature and concentration from the 1D2 level of Pr3+ in YPO4

“…For phosphor applications, transitions within the 4f configuration are most relevant, in particular the 1 D 2 -3 H 4 transition in the red. The work reported here is concerned with the decay from the 1 D 2 level in Pr-doped YPO 4 . The YPO 4 :Pr system has been studied by several workers [4][5][6][7][8][9].…”

“…The work reported here is concerned with the decay from the 1 D 2 level in Pr-doped YPO 4 . The YPO 4 :Pr system has been studied by several workers [4][5][6][7][8][9]. These various works report on emission characteristics of the 3 P 0 and 1 D 2 levels, and have all discussed the topic of the decay of the 1 D 2 level.…”

Luminescence properties of Sm3+ doped YPO4: Effect of solvent, heat-treatment, Ca2+/W6+-co-doping and its hyperthermia application

“…15 The origin of luminescent properties is from the intra 4f and 4f-5d transitions of different kinds of rare earth ions, especially the intra 4f transitions which are less influenced by the surrounding ligands owing to the shielding of the 4f orbital by the outer 5s and 5p orbitals. Though [16][17][18][19][20][21][22][23][24] The lowest excited level of Sm 3+ is 4 G 5/2 and it has three main emitting levels 6 H j (j = 5/2, 7/2 and 9/2) located at 564, 601 and 645 nm, respectively, which gives reddish-orange emission. 23,24 However, when wet a Author to whom correspondence should be addressed.…”