Multiple Charge Transfer Bands Induced Broad Excitation Eu³⁺ Red Emission in a Vanadium Phosphate System for White Light-Emitting Diodes

Abstract

In order to realize broad excitation and narrow emission red light phosphor, a new vanadium phosphate Ba2BiV2PO11 was selected as a host for Eu3+. Monitored at 619 nm, a wide band from 240 to 400 nm could be observed and inferred to be composed of Eu3+–O2– and V5+–O2– charge transfer bands, which could make it match well with the UV chip and the blue chip along with the characteristic excitation of Eu3+ at 465 nm. Under 354 nm excitation, the sample could emit high color purity red light, and the thermal quenching integral intensity showed good thermal stability. The generation of charge transfer bands was investigated in detail combined with the luminescence properties and the structure of the matrix. Moreover, the as-prepared phosphor could improve the white light performance of blue chip-activated YAG:Ce3+ and n-UV chip-activated tricolor phosphors. All the results indicated the multiple application potential of Ba2BiV2PO11:Eu3+ for white light-emitting diodes.

Recent progress in trivalent europium (Eu3+)-based inorganic phosphors for solid-state lighting: an overview

“…Moreover, the Ba 2 BiV 2 PO 11 :Eu 3+ phosphor-based white LED showed better performance. 161 The Na 3 Y(VO 4 ) 2 :Eu 3+ (NYVO:Eu 3+ ) phosphor was studied as a multifunctional material for red light-emitting diodes and non-contact thermometry. The PL study reveals that the phosphor exhibits broadband emission and sharp lines from the (VO 4 ) 3 groups and Eu 3+ ions, respectively.…”

Achieving visible and near-infrared dual-emitting mechanoluminescence in Mn2+ single-doped magnesium aluminate spinel

“…Hence, in situ, realtime, and in vivo biomechanical sensing is further expected to realized. [40][41][42]…”

Ultra-bright and thermally stable deep red emitting doped yttrium zirconate nanoparticles for tunable white LEDs and indoor plant growth

“…19 The existing commercial red phosphors are Eu 2+ activated systems (Sr 2 Si 5 N 8 :Eu 2+ and CaAlSiN 3 :Eu 2+ ) which possess low color purity and low luminous efficiency due to the broadband emission originating from the fd transitions of Eu 2+ leading to the serious issue of photon reabsorption. [20][21][22] Comparing Eu 3+ with Eu 2+ , the former has a sharp red emission band due to the ff transition. 22 Even though both are the same rare earth element, their luminescence properties are different due to the different electronic structures they possess.…”