Bi3+ sensitized Gd2O3:Eu3+: A potential red phosphor for UV LED pumped white light emission

Hydrothermal Synthesis of Rod Shaped Red Emitting Gd2O3:Eu3+ Phosphor

“…Similar observation has been earlier reported in PVP functionalized AgSe and Gd2O3 which is because of bond weakening due to partial donation of oxygen [31,36]. This red shift of C=O bond absorption may be the reason behind the non-observance of −OH bending vibration mentioned earlier.…”

“…Gd−O bond vibrations are observed at 545 and 491 cm −1 with the disappearance of Gd−OH band. This indicates that the Gd2O3 is formed [31]. The vibrational peaks at 1495, 1385, 1087, and 1022 cm −1 are due to carbonate (CO3 2-) [38,39].…”

“…It is well-known from the Judd-Ofelt theory, that the transitions due to electric dipole is dependent on the surroundings of Eu 3+ but magnetic dipole is not [31,32,37]. This can be understood by considering the crystal structure of Gd2O3.…”

“…Gd2O3:Eu 3+ phosphor has been widely reported as potential red phosphor [24][25][26]. Lately, Gd2O3:Eu 3+ phosphors and Bi 3+ sensitized Gd2O3:Eu 3+ are reported as potential for solid state lighting applications [3,4,24,30,31]. Also, real-time optical and magnetic resonance imaging as well as sensing of heavy metals etc.…”

Uranium-Sensitized Luminescence Enhancement in Li2B4O7:U6+,Eu3+ and Potential Application towards Color-Tunable Phosphors and Actinide Sensor

“…Previously, researchers have used Al 3+ , Mn 2+ , and Bi 3+ for sensitizing the europium luminescence. − Since these ions involve s and d electrons, there is always an energy mismatch between Eu 3+ and these ions, so efficient energy transfer may not happen despite their good absorption in the blue and near-UV regions. Utilizing Ce 3+ as a sensitizer for Eu 3+ is not feasible due to quenching through metal-to-metal charge transfer (MMCT) .…”