Photoluminescent properties of Dy3+-activated REAl3(BO3)4 (RE=Y, La, Gd) polycrystalline phosphors from hybrid precursors

Synthesis and characterization of YNbTiO6:Dy3+ phosphor

“…However, the ratio of 4 F 9/2 -6 H 15/2 transition to 4 F 9/2 -6 H 13/2 transition (B/Y) is almost constant over the full range of Dy 3+ concentration in this host, which indicates that high concentration of Dy 3+ does not greatly change surrounding environment. This phenomenon is different from Dy 3+ in other hosts, such as Ca 8 Mg(SiO 4 )Cl 2 [22] and REAl 3 (BO 3 ) 4 [23] host. In the case of Dy 3+ -doped Ca 8 Mg(SiO 4 )Cl 2 and REAl 3 (BO 3 ) 4 phosphors, different Dy 3+ concentration causes different ratio of B/Y.…”

Preparation and luminescent characteristics of Sr3RE2(BO3)4:Dy3+ (RE=Y, La, Gd) phosphors for white LED

“…All the excitation spectra show similar features, so Sr 3 Y 2 (BO 3 ) 4 :Dy 3+ will be used for discussion purposes. There are some sharp absorption peaks in wavelength region of 300-500 nm, which are due to excitation of the f-f shell transitions of Dy 3+ [15]. The several band peaks at 326 nm, 350 nm, 365 nm, 387 nm, 426 nm, 453 nm and 473 nm correspond to the transitions from the ground state 6 H 15/2 to the excited states 4 K 15/2 ; 4 P 7/2 ; 4 P 3/2 ; 4 F 7/2 ; 4 G 21/2 ; 4 H 15/2 ; and 6 F 9/2 , respectively, and the maximum excitation wavelength is located at 350 nm [15,16,18].…”

“…Dysprosium ion with a 4f 9 configuration has complicated f-block energy levels and between these levels various transitions result in sharp line spectra [13][14][15]. Dy 3+ ion exhibits three visible emission bands including a blue emission at 484 nm, corresponding to the 4 F 9/2 → 6 H 15/2 transition, a yellow emission at 575 nm, corresponding to the hypersensitive transition 4 F 9/2 → 6 H 13/2 ( L = 2; J = 2), and a weak red emission at 665 nm, corresponding to the 4 F 9/2 → 6 H 11/2 transition.…”

Luminescence optimization of Eu-doped LnAl3(BO3)4 (Ln=Y, Gd) red phosphor using spray pyrolysis

“…The luminescence intensity of LnAl 3 (BO 3 ) 4 :Eu 3 + phosphor, however, is still low compared with the commercial red phosphor (Y,Gd)BO 3 :Eu 3 + [11]. Recent researches of LnAl 3 (BO 3 ) 4 :Re mostly focus on the luminescence properties of varying Ln elements such as Y 3 + , La 3 + , Gd 3 + , Sc 3 + , and Bi 3 + or rare earth ions such as Eu 3 + , Tb 3 + , Er 3 + , Dy 3 + , and Pr 3 + [16,17]. Also, a solidstate reaction method was mostly used to prepare the LnAl 3 (BO 3 ) 4 :Eu 3 + phosphor [11][12][13][15][16][17].…”

“…Recent researches of LnAl 3 (BO 3 ) 4 :Re mostly focus on the luminescence properties of varying Ln elements such as Y 3 + , La 3 + , Gd 3 + , Sc 3 + , and Bi 3 + or rare earth ions such as Eu 3 + , Tb 3 + , Er 3 + , Dy 3 + , and Pr 3 + [16,17]. Also, a solidstate reaction method was mostly used to prepare the LnAl 3 (BO 3 ) 4 :Eu 3 + phosphor [11][12][13][15][16][17]. Spray pyrolysis is one of the promising methods to prepare phosphors, which consist of multi-components [18][19][20][21][22].…”