A High Stable Blue BaSi3Al3O4N5:Eu2+ Phosphor for White LEDs and Display Applications

Abstract

A novel BaSi 3 Al 3 O 4 N 5 :Eu 2þ blue phosphor has been developed for the first time. Rietveld refinements of XRD data indicate that BaSi 3 Al 3 O 4 N 5 crystallizes in the monoclinic space group P2 1 /m. This phosphor exhibits comparable photoluminescence intensity with that of commercial BaMgAl 10 O 17 :Eu 2þ blue phosphor under vacuum ultraviolet (VUV) and near-ultraviolet (NUV) excitation. Furthermore, it shows excellent thermal and chemical stabilities, high quenching temperature, and higher converting efficiency under NUV excitation. The excellent photoluminescence and stability have been analyzed in terms of the stiff crystal structure of BaSi 3 Al 3 O 4 N 5 . This phosphor could be a promising blue candidate for light-emitting diodes and plasma display panels.The driving forces of the recent developments are climate change, energy saving, and energy efficiency. 1 White light-emitting diodes (WLEDs) (Ref. 2) are generally believed to be the next generation luminescent technology, owing to their long lifetime, low energy consumption, environmental friendliness, and high reliability. Most commercially available WLEDs are produced by combining a blue diode chip with Y 3 Al 5 O 12 :Ce 3þ yellow phosphor, but they show poor color rendering and low stability of color temperature. 3 One alternative way to achieve white light is the combination of red, green, and blue phosphors with a near-ultraviolet (NUV) diode. 3 Up to now, BaMgAl 10 O 17 :Eu 2þ (BAM) phosphor 4 is the best blue phosphor and widely used in three-band fluorescence lamps and plasma display panels (PDPs) for its high quantum efficiency. Unfortunately, it suffers from a deterioration of color quality and efficiency during panel fabrication (thermal treatment in air) and panel operation (VUV damage). In addition, it is not well suitable for NUV LED chip due to its low quantum efficiency under 340-420 nm excitation.Various efforts have been made to develop novel blue phosphors, such as Ba phosphors have many disadvantages of photoluminescence or stability. For example, Ba 5 SiO 4 Cl 6 :Eu 2þ must be kept away from any moisture, the intensity of BaAl 2 Si 2 O 8 :Eu 2þ decreases sharply after being baked at 600 C in air, and SrAl 10Àx B x Si 2 O 20 :Eu 2þ has too many polymorphs to get pure phase. The application of a phosphor should meet the comprehensive standards, such as high quantum efficiency, good thermal and chemical stabilities, high quenching temperature. Therefore, efforts are still being made to explore novel blue phosphors.Recently, rare-earth doped (oxy)nitridosilicate phosphors have attracted more and more attentions due to their thermal and chemical stability because of the strong covalent Si(O,N) 4 network of the lattice. 10-12 Based on these facts, we succeeded in synthesizing a novel BaSi 3 Al 3 O 4 N 5 :Eu 2þ (BSAON) blue phosphor. It exhibits comparable photoluminescence intensity with that of commercial BAM, what's more, it presents many superior properties than BAM, such as higher converting efficiency in the NUV light range, h...

Luminescent properties of a novel Al10O3N8:Eu2+ phosphor by a mechanochemical activation route

“…To our best knowledge, rare research on the VUV excitation spectra for oxynitride phosphors has been reported [21,22]. In this work, Al 10 O 3 N 8 :Eu 2+ phosphor also shows good VUV luminescence property as shown in the inset (right) of Fig.…”

Insight the Luminescence Properties of AlON: Eu, Mg Phosphor under VUV Excitation

“…In addition to the general luminescence properties under ultraviolet (UV) or blue light excitation, it has been proved that some of oxynitride phosphors show intriguing luminescence under VUV excitation [13,14]. To the best of our knowledge, there is still no report on the VUV luminescence properties of AlON based phosphors.…”

Review: Down Conversion Materials for Solid‐State Lighting

“…[81][82][83] The compositions with the highest QY are the halophosphates (apatites) having a generic formula A 5 (PO 4 ) 3 Cl:Eu 2+ (A = Sr, SCAP; Ba, BCAP; Ca, CCAP; or a mixture of the alkaline earth elements), which have QYs > 90%. Most compositions have Eu 2+ activators with emission peaks ranging from 420 to 490 nm.…”