Electroluminescence of SrAl2O4:Eu2+ phosphor (original) (raw)

Abstract

The SrAl 2 O 4 :Eu 2þ phosphor powders have been synthesized by sol-gel process. Electroluminescent (EL) properties of the SrAl 2 O 4 :Eu 2þ phosphor were investigated using a convenient thick film device. Green light emitting at a peak of 508 nm was obtained when driven by sine alternating current (AC). The color coordinate of the emission was x ¼ 0:148 and y ¼ 0:635: Luminance -voltage and afterglow characteristics of the SrAl 2 O 4 :Eu 2þ EL devices were studied. The results show that SrAl 2 O 4 :Eu 2þ can be used as green phosphor for EL displays. q

Key takeaways

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  1. SrAl2O4:Eu2+ emits green light at 508 nm under AC drive, demonstrating potential for EL displays.
  2. Color coordinates of the emission are x = 0.148 and y = 0.635, indicating suitable color purity.
  3. Luminance of SrAl2O4:Eu2+ thick film EL device reaches about 10^23 cd/m^2, lower than optimal expectations.
  4. The threshold voltage for the EL device is approximately 40 V, which is competitive among oxide phosphors.
  5. The study aims to improve luminance and explore multicolor capabilities of SrAl2O4:Eu2+ phosphor.

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