Blue luminescence of nanocrystalline CaZrO3:Tm phosphors synthesized by a modified Pechini sol–gel method

Synthesis and the luminescent properties of CdNb2O6 oxides by sol–gel process

“…The absorption peak was shown at about 300 nm. Some observed differences in the excitation and absorption spectra peaks are ascribed to the absorption of defect levels in the host [19]. In particular, the oxygen vacancies played an important role in the formation of these defect levels.…”

Photoluminescence and energy transfer of Tm3+ doped LiIn (WO4)2 blue phosphors

“…Yan et al [10] reported the 1 G 4 -3 H 6 (475 nm) emission transition of Tm 3 + ion in Y x Gd 1 À x VO 4 :Tm 3 + under 275 nm excitation wavelength. Zhang et al [11] In a previous paper, we have shown that the 1 G 4 -3 H 6 emission transition of Tm 3 + in LiIn(WO 4 ) 2 compound was very efficiently excited via the host lattice [12]. We have reported the presence of strong absorption band assigned to the absorption of (WO 4 ) À 2 groups in the excitation spectrum, monitoring the 1 G 4 -3 H 6 emission transition, indicating an ET from (WO 4 ) À 2 groups to 1 G 4 energy level of Tm 3 + ions in LiIn(WO 4 ) 2 .…”

UV–VUV-excited photoluminescence of Tm3+ substituted β-rhenanite as a blue-emitting phosphor

“…3 acquired by fixing the monitor wavelength at 451 nm. The curve shows notably one intense peak at 356 nm, which could be attributed to the absorption of 3 H 6 -1 D 2 of Tm 3 + [31]. The excitation band ranged from 200 to 300 nm could be assigned to the charge transfer band (CTB) of Tm 3 + -O 2 À according to Ref [32].…”