Broad yellow orange emission from SrAl2O4:Pr3+ phosphor with blue excitation for application to white LEDs

Blue excited photoluminescence of Pr doped CaBi2Ta2O9 based ferroelectrics

“…Previous study showed that for a large amount of Pr ions up to x = 0.15 added in Sr 1−x Pr x Bi 2 Ta 2 O 9 solid solution, the sample can keep pure BLSF crystal structure without second phase [27]. The crystal structure of CaBi 2 Ta 2 O 9 is similar to SrBi 2 Ta 2 O 9 , so it is not strange for Ca 1 peaks around 450, 474 and 492 nm are due to the 3 H 4 → 3 P 2 , 3 H 4 → 3 P 1 and 3 H 4 → 3 P 0 transitions, respectively [22][23][24]. It can be seen from the excitation spectra that a band located at 250-340 nm is relatively low, which is not related to any of the transition in the energy levels of Pr 3+ ions; rather it can only be associated with the electronic transition within the host solid.…”

“…4. When electrons are excited to 3 P 2 levels with 450 nm excitation, they relax nonradiatively to 3 P 1 , 3 P 0 and 1 D 2 states and recombined to lower levels of 3 H 4 , 3 H 5 , 3 H 6 and 3 F 2 , the red emission band centered at 621 nm and 658 nm are attributed to the 3 P 0 → 3 H 6 and 3 P 0 → 3 F 2 transitions, respectively [22][23][24]. The green emission located at 535 and 548 nm are attributed to the 3 P 1 → 3 H 5 and 3 P 0 → 3 H 5 transitions, respectively [30].…”

“…The blue excited phosphors are of great significance in the fields of solid state illuminant applications, which are higher efficiency, more safety and environmental friendliness than traditional incandescent and fluorescent lamps [8,21]. For these purposes, blue-excited phosphor based on Pr 3+ -doped oxide hosts such as BaMoO 4 [22], AgLaMo 2 O 8 [23] and SrAl 2 O 4 [24] have been reported. But these oxide hosts do not exhibit electrically functional properties, which cannot meet the integrated applications, for instance, integrated optical and electrical devices.…”

A new red phosphor LaNb0.70V0.30O4:Eu3+ for white light-emitting diodes

“…Phosphor-converted light-emitting diode (LED) technique is an important solid-state illumination in which tricolor phosphors are pumped by ultraviolet (UV) InGaN chips, thereby generating white light [1][2][3][4][5]. With the development of LED chip technology, the emission band of LED chips has shifted from blue light (∼460 nm) to near UV range (350-400 nm), with the near UV light providing higher energies to produce the phosphors [6,7].…”

Enhanced blue emission and EPR study of LaMgAl11O19:Eu phosphors

“…In particular, the luminescence in the visible region of Eu 2 + -doped alkaline-earth aluminate phosphors has attracted much attention in recent years and a number of researchers have made extensive investigations concerning the next generation of displays and lighting devices [1][2][3][4][5]. However, there are a very few reports on Eu doped materials with magnetoplumbite structure.…”