Synthesis and modification of red oxide phosphors for low voltage excitation

Abstract

New red oxide phosphors Y 2 O 3 :Eu 3ϩ ,Si 4ϩ and ͑Y,Gd͒ 2 O 3 :Eu 3ϩ ,Si 4ϩ ,Bi 3ϩ are synthesized by a coprecipitation method. Relative cathodoluminescence ͑CL͒ brightness at low voltages (р1 kV͒ is analyzed. At the low voltage excitation, luminance of the synthesized phosphors is higher than that of other commercially available red phosphors Y 2 O 2 S:Eu 3ϩ and Y 2 O 3 :Eu 3ϩ . In particular, the difference of relative brightness between the commercially available phosphors and the synthesized Y 2 O 3 :Eu 3ϩ ,Si 4ϩ is larger at low voltages (р500 V͒ than at higher voltages. The synthesized ͑Y,Gd͒ 2 O 3 :Eu 3ϩ ,Si 4ϩ ,Bi 3ϩ phosphor gives the same level of brightness as that of Y 2 O 3 :Eu 3ϩ ,Si 4ϩ at voltages greater than 500 V. ͑Y,Gd͒ 2 O 3 :Eu 3ϩ ,Si 4ϩ ,Bi 3ϩ is coated with a conductive material SnO 2 :Eu 3ϩ . The coating of SnO 2 :Eu 3ϩ shows a considerable improvement in brightness without a color shift. The excellent luminescence characteristics of ͑Y,Gd͒ 2 O 3 :Eu 3ϩ ,Si 4ϩ ,Bi 3ϩ coated with SnO 2 :Eu 3ϩ , studied using field emitter arrays, suggests that our synthesized phosphor is practically applicable to field emission display devices.

Shape-tailored photoluminescent intensity of red phosphor Y2O3:Eu3+

“…As a well-known red phosphor for low-pressure fluorescent lamps, cathode-ray tubes and plasma display panels [5], luminescent properties of Eu 3+ -doped Y 2 O 3 have been well investigated [6][7][8][9][10]. Over the last decade, many new methods for synthesis of the Eu-doped Y 2 O 3 phosphor have been reported, including solutioncombustion method [11,12], sol-gel method [13,14], spray pyrolysis method [15,16] and precipitation method [17][18][19]. Many morphologies, such as nanobelts [17], nanoparticles [18,20,21], nanotubes [14,22,23], nanowires [24] and nanorods [25], have been synthesized.…”

Effect of Eu,Tb codoping on the luminescent properties of Y2O3 nanorods

“…Significant attention has been paid to rare-earth-ions doped semiconducting nanoparticles to find out the potential applications in photonic and biophotonic fields [3][4][5][6]. Rare-earth-ions doped yttrium oxides (Y 2 O 3 ) are important optical materials, which exhibit excellent luminescent efficiency, color purity, and chemical and thermal stability [7,8]. They have been applied in opto-electronic devices including flat panel displays, solar energy conversion devices, ultraviolet emitters, plasma display panel (PDP) and field emission display (FED).…”

Synthesis of Y2O3:Eu phosphors by bicontinuous cubic phase process

“…To develop the Y 2 O 3 :Eu phosphors with spherical shape, well crystalline, high chemical purity, homogeneity and high luminescence efficiency, many different techniques have been reported in the literature, including solid-state reaction [6][7][8], combustion [9][10][11], spray pyrolysis [12][13][14][15][16], co-precipitation [8,17,18], sol-gel [19][20][21], microemulsion [22][23][24][25], hydrothermal [26] and so on. In general, the hightemperature solid-state reaction and combustion produce large aggregates which must be ground or milled to obtain finer powder.…”