Structural and wavelength dependent optical properties of La1-xEuxCoO3 perovskite phosphor

Effect of Cr3+ doping on structural and optical properties of Eu3+ doped LaVO4 phosphor

“…The spectra also contain many sharp weak peaks at 362, 376, 381, 393, 413 and 464 nm, which are due to 7 F 0 / 5 D 4 , 7 F 0 / 5 L 8 , 7 F 0 / 5 L 7 , 7 F 0 / 5 L 6 , 7 F 0 / 5 D 3 and 7 F 0 / 5 D 2 transitions of Eu 3+ ion, respectively. [11][12][13][14][15][16][17][18][19][20][21][22][23]32,33 The intensity of these peaks follows the trend l 393 > l 464 > l 362 . The peak at 393 nm lies in the region of n-UV LED; therefore, it is very important.…”

“…In all the cases, we have observed intense bands in between 520-700 nm regions due to 5 D 0 / 7 F J transitions. [11][12][13][14][15][16][17][18][19][20][21][22][23]32,33 The intensity of emission bands on excitation with CTB wavelength is nearly 10 times larger than on excitation with discrete bands of Eu 3+ ion i.e. at 393 nm.…”

“…The other observed bands are due to 5 D 0 / 7 F 0 (579 nm), 5 D 0 / 7 F 1 (582 and 591 nm), 5 D 0 / 7 F 3 (644 nm) and 5 D 0 / 7 F 4 (700 nm) transitions. [11][12][13][14][15][16][17][18][19][20][21][22][23]32,33,45,46 The intensity of the bands follows the 7 F 2 > 7 F 1 > 7 F 4 > 7 F 3 > 7 F 0 trends. Though the excitation wavelengths (316 and 393 nm) populate high lying levels of Eu 3+ ion; however, due to closeness of the energy levels, the excited Eu 3+ ions relax rapidly to low lying 5 D 1 and 5 D 0 excited states.…”

“…In several cases, the sensitizer plays a dominant role. 11–15 These materials have promising applications in different fields, such as display devices, light emitting diodes (LEDs), white LEDs, tunable color sources, optoelectronic devices, luminescent security ink, solar energy converters, optical heating, temperature sensing, bio-imaging, etc . 1–15…”

“…[11][12][13][14][15] These materials have promising applications in different elds, such as display devices, light emitting diodes (LEDs), white LEDs, tunable color sources, optoelectronic devices, luminescent security ink, solar energy converters, optical heating, temperature sensing, bio-imaging, etc. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The Eu 3+ ion is a well-studied rare earth ion. It emits almost pure red color and oen used in display devices, color televisions and computer screens.…”