Synthesis, Structure, and Tunable Luminescence Properties of Novel Ba₃NaLa(PO₄)₃F:Eu²⁺,Mn²⁺ Phosphors

Abstract

A series of luminescent emission‐tunable phosphors Ba3NaLa(PO4)3F:Eu2+,Mn2+ have been prepared by a high‐temperature solid‐state reaction. The Rietveld refinement analysis confirms that the obtained phosphors possess pure apatite crystalline phase and the sites' occupancy of dopant has been also discussed. Upon the excitation of 355 nm, the emission spectra of Ba3NaLa(PO4)3F:Eu2+,Mn2+ consist of two broad bands assigned to 5d–4f transition of Eu2+ and 4T1 (4G)–6A1 (6S) transitions of Mn2+, respectively. Energy transfer (ET) occurs in Eu2+, Mn2+ codoped Ba3NaLa(PO4)3F host. On the basis of the thorough analysis and comparison upon their excitation, emission properties, and the decay behaviors, it is demonstrated that the ET mechanism between Eu2+ and Mn2+ is ascribed to the exchange interaction, and the tunable emission color in the novel apatite host can be realized.

Luminescence properties and energy transfer behavior of colour-tunable white-emitting Sr4Al14O25 phosphors with co-doping of Eu2+, Eu3+ and Mn4+

“…With the ever-increasing demands of humankind for illumination quality, white light-emitting diodes (WLEDs) are replacing the incandescent and uorescent lamps gradually and becoming a new generation of solid state lighting sources for buildings and scenery lighting, LCD backlighting, interior lighting, automobiles, agriculture, medicine and aerospace. [1][2][3][4] At present, the commercial method to generate white light emission is exciting the yellow-emitting Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) with an InGaN light-emitting diode (LED) chip which emits blue light with the wavelength between 450 nm and 480 nm typically. 5,6 Because of the emission deciency in the red region, this WLED shows poor colour rendering and appears a simple cool white.…”

Color tunable Ba0.79Al10.9O17.14:xEu phosphor prepared in air via valence state control

“…Generally, Eu 2+ ions are usually used as an activator  of the blue luminescent materials because of the predominant 4F 6 5D-4F 7 transition peaking from 400 to 550 nm [13,14]. 2+ and Eu 3+ was proved by photoluminescence spectra, diffuse reflection spectra, and X-ray photoelectron spectra.…”

Tunable luminescence properties and energy transfer of Ba3NaLa(PO4)3F:Tb3+,Sm3+ phosphors with apatite structure

“…Meanwhile, Z is mainly composed by the F À , OH À , Cl À ions [12][13][14][15][16][17][18]. Ba 3 NaLa(PO 4 ) 3 F compound belongs to hexagonal symmetrical system with the apatite structure has been widely reported as the efficient luminescence materials for white LEDs [19,20]. However, to our best knowledge, the luminous performance and energy transfer mechanism in Tb 3 þ and Sm 3 þ co-doped Ba 3 NaLa(PO 4 ) 3 F phosphors have not been reported yet.…”