The synthesis and luminescence of YPxV1−xO4:Dy3+ microcrystalline phosphors by in situ co-precipitation composition of hybrid precursors

Synthesis and luminescent properties of nanosized YVO4:Ln (Ln=Sm, Dy)

“…Rare earth ions doped yttrium orthovanadate phosphors such as red-emitting materials YVO 4 :Eu [1][2][3][4][5][6], blue-emitting materials YVO 4 :Tm [7] and so on [8][9][10] have taken special attention due to their wide applications in lamps and displays. Moreover, recent investigations show that nanosized YVO 4 :RE phosphors have a significant promise in high definition flat display panel, such as plasma display panels (PDP) and field emitting display (FED) [1,2].…”

Zr_0.98Dy_0.01Sm_0.01O₂ Işıldarının Sentezi, Karakterizasyonu ve Fotolüminesans Özelliklerinin İncelenmesi

“…'de görülmektedir. Zr0.99Dy0.01O2 uyarma spektrumunda 260 nm'de gözlenen yayvan absorpsiyon bandı O 2− →Dy 3+ iyonları arasında ki yük transfer geçişlerini (LMCT) göstermektedir [7,8]. Uyarma spektrumundaki 300 nm ve 450 nm'de gözlenen absorpsiyon bandları ise Dy 3+ iyonunun f-f geçişlerinden kaynaklanmaktadır.…”

“…'de görülmektedir. Uyarma spektrumunda 260 nm'de gözlenen yayvan absorpsiyon bandı O 2− →Dy 3+ ve O 2− →Sm 3+ iyonları arasında ki yük transfer geçişlerini (LMCT) göstermektedir [7,8,12]. 366 nm, 410 nm ve 475 nm'deki uyarma banları Sm 3+ iyonunun 6 H5/2→ 4 D3/2, 6 H5/2→ 6 P3/2, 6 H5/2→ 4 I11/2 elektronik geçişlerinden kaynaklanmaktadır [13].…”

Effect of Bi3+ on fluorescence properties of YPO4:Dy3+ phosphors synthesized by a modified chemical co-precipitation method

“…It is noteworthy that the broad excitation band around 294 nm cannot be attributed to host band absorption and the charge transfer band (CTB) for Dy 3 + because the bandgap energy of YPO 4 is around 144 nm [14][15][16][17] and the charge transfer band due to Dy 3 + -O 2 À is below 168 nm for YPO 4 host [14,18,19], which needs further investigations. A relatively weak excitation band including two stronger peaks at 352 and 365 nm can be seen in the longer wavelength region (330-450 nm) owing to the f-f transition within 4f 9 electron configuration of Dy 3 + [14,[20][21][22][23]. Main peaks at 294, 326, 352 and 365 nm correspond to the electron transitions of Dy 3 + from the ground state 6 H 15/2 to higher levels 4 K 13/2 , 4 K 15/2 , 4 M 15/2 + 6 P 7/2 and 4 I 11/2 [20,21,23], respectively.…”