Luminescence and energy transfer in Ce³⁺, Mn^2+‐doped K₂AEP₂O₇ (AE = Ca, Sr) phosphor

Abstract

Pyrophosphates K2AEP2O7 (AE = Ca, Sr) prepared by the classical solid-state technique and activated with Ce(3+) are described. Intense emission was observed in K2AEP2O7 (AE = Ca, Sr). The effect of Mn(2+) co-doping was studied. The broad emission peak of Mn(2+) was observed at 534 nm in K2 rP2O7:Ce(3+) and at 539 nm in K2CaP2O7:Ce(3+), Mn(2+). Mn(2+) emission was greatly enhanced by addition of the sensitizer Ce(3+) due to efficient energy transfer from Ce(3+) to Mn(2+).

Synthesis, Crystal Structure and Photoluminescence of a Gd5Si3O12N:Eu2+Green Emitting Phosphor

“…For the exchange interaction, the critical resonance distance (R C ) between the activators should be less than 5 Å. 19 As reported by Blasse, the following equation can be used to calculate R C :…”

Proton Conduction in Organically Templated 3D Open-Framework Vanadium–Nickel Pyrophosphate

“…At present, focus on metal pyrophosphates is growing rapidly due to their outstanding properties in terms of luminescence, − nonlinear optical behavior, − and ionic conduction. − However, there are only several isostructural TP 2 O 7 (T = Sn, Ti, Si, Ge, Ce, and Zr) that have exhibited proton conductivities on the order of 10 –3 –10 –2 S cm –1 in the temperature range from 100 to 400 °C under anhydrous conditions. − The frameworks of these materials are built up of metal–oxygen polyhedral and pyrophosphate units through sharing their corners and edges to form closely packed structures. As is well-known, organic amines are able to be used as templates to synthesis microporous inorganic materials.…”

Design of Novel Highly Efficient Yellow-Orange Color-Tunable Luminescence in Rb2Sr1–yCayP2O7:xEu2+ Solid Solutions for White Light-Emitting Diodes

“…Among the commonly used activators, we are particularly interested in obtaining a targeted phosphor with Eu 2+ ions. − The Eu 2+ ion-doped phosphors can absorb n-UV to blue light and efficiently transform it into visible light even to the near-infrared region, and luminescence spectral tuning is easily fulfilled by the variation of the host structure. , To search for a proper host for Eu 2+ ion doping, we focus mainly on phosphates because of their good chemical stability, moderate synthesis temperatures, and high luminous efficiency . Among their abundant family members, the A 2 MP 2 O 7 (A = Li, Na, K, or Rb; M = Mg, Ca, or Sr) system has attracted the most attention and been thoroughly investigated as a host matrix. − In their basic structure, two [PO 4 ] tetrahedra connect as a [P 2 O 7 ] group via corner-sharing the same O atoms. Then the [P 2 O 7 ] groups concatenate with [MO 6 ] octahedra to form the framework.…”