Novel Broadband Excited and Linear Red‐Emitting Ba₂Y(BO₃)₂Cl:Ce³⁺, Tb³⁺, Eu³⁺ Phosphor: Luminescence and Energy Transfer

Abstract

A series of Ce 3+ , Tb 3+ , Eu 3+ tri-doped Ba 2 Y(BO 3 ) 2 Cl redemitting phosphor have been synthesized by solid-state method. The Ce 3+ ?Tb 3+ ?Eu 3+ energy-transfer scheme has been proposed to realize the sensitization of Eu 3+ ion emission by Ce 3+ ions. Following this energy-transfer model, near-UV convertible Eu 3+ -activated red phosphors have been obtained in Ba 2 Y(BO 3 ) 2 Cl: Ce 3+ , Tb 3+ , Eu 3+ phosphors. Energy transfers from Ce 3+ to Tb 3+ , and Tb 3+ to Eu 3+ , as well as corresponding energy-transfer efficiencies are investigated. The combination of narrow-line red emission and near-UV broadband excitation makes Ba 2 Y(BO 3 ) 2 Cl: Ce 3+ , Tb 3+ , Eu 3+ as a novel and efficient red phosphor for NUV LED applications.

Preparation and luminescence properties of orange–red Ba3Y(PO4)3:Sm3+ phosphors

“…where hm is the incident photon energy, A is a proportional constant, Eg is the value of the bandgap, n = 2 for a direct transition or 1/2 for an indirect transition, and F(R 1 ) is Kubelka-Munk function which is defined as [17]:…”

Surface Plasmon Resonance Enhanced Spontaneous Upconversion and Stimulated Emissions in Glass Ceramics Containing Ba2LaF7 Nanocrystals

“…The lifetime decreases after the first increase, and the variation tendency agrees well with the change of UC luminescence intensities of green emission. The lifetime result is an evidence of an accelerating energy transfer from Yb 3+ to Er 3+ with increasing Ag NPs content [24,25], which indicates that some energy transfer from fluorescent Ag NPs to Er 3+ cannot be totally ignored. Interestingly, microcavities can be realized by randomly embedding Ba 2 LaF 7 :Yb 3+ , Er 3+ nanocrystals inside the glass and random lasing action can be achieved in the glass ceramic.…”

Combinatorial optimization of the atomic compositions for green-emitting YBO3:Ce3+,Tb3+ and red-emitting YBO3:Ce3+,Tb3+,Eu3+ phosphors using a microplate reader

“…With increasing Eu 3+ concentration, h increased until it approached unity over an Eu 3+ concentration of 2.5 at%, while the PL intensity of Eu 3+ decreased over this concentration. This result would indicate that concentration quenching of Eu 3+ , 52,53 caused by enhancement of probability of a non-radiative relaxation through the energy migration of Eu 3+ / Eu 3+ , occurred when the Eu 3+ concentration exceeded 2.5 at%. It should be noted that the MMCT effect between Ce 3+ and Eu 3+ was ignored for the calculation of h. The decrease in PL intensity might be affected by enhancement of the MMCT as well as the concentration quenching.…”