Luminescence properties of GaBO3: Bi3+

Effect of Ga3+Doping on the Photoluminescence Properties of Y3Al5-xGaxO12:Bi3+Phosphor

“…Chen et al [18][19][20] found two broad band emission regions at 140-220 nm and 230-290 nm for YBO 3 respectively. [1][2][3]21 The 29 nm shift in position from the excitation to the emission is due to the well-known Stokes shift. Additionally, the luminescence of Bi 3+ exhibited a red-shift with an increase in the Ga content inside the YAG host.…”

“…30 The lowest part of the conduction band is occupied by the Ga-3d and Y-4d states approximately at 5 eV, 30 which is similar to the observed study carried out by Wang et al 14 and Ueda et al 6 These studies were important to confirm that indeed the introduction of Ga in the YAG matrix lowers the edge of the conduction band. The PLE band is attributed to the 1 S 0 -3 P 1 transitions 31 and the PL band is attributed to the 3 P 1 -1 S 0 transition. 17,31 The bands then experience a redshift as a consequence of the change in the crystal environment as the Ga ions are incorporated into the matrix.…”

“…The PLE band is attributed to the 1 S 0 -3 P 1 transitions 31 and the PL band is attributed to the 3 P 1 -1 S 0 transition. 17,31 The bands then experience a redshift as a consequence of the change in the crystal environment as the Ga ions are incorporated into the matrix. The shifts are identified using the broad band which shifts to lower energies as the Ga is incorporated in the electronic structure (Figure 8).…”

“…Som et al, 28 calculated the covalency parameter for Eu-O bond using PL data. The nephelauxetic parameter (β − ) is regarded as a measure of covalency and expressed mathematically as [2] where "ν" is the wave number of an absorption transition of Bi 3+ and "n" is the number of observed absorption transitions which in this case is one. The wavenumber positions of the free Bi ions have been taken from Ref.…”

“…It is essential to search for highly efficient phosphors that have broadly tunable emissions and minimal excitation in the visible range. Trivalent bismuth cations (Bi 3+ ) with outer 6s 2 electronic configuration have been doped into a variety of host lattices, and they been shown to exhibit interesting tunable emission 1 over a broad range of wavelengths. The literature shows that the absorption bands of Bi 3+ are usually attributed to the 1 S 0 -1 P 1 and the 1 S 0 -3 P 1 transitions, which are both allowed due to spin-orbit coupling.…”