Melilite-Structure CaYAl3O7:Eu3+ Phosphor: Structural and Optical Characteristics for Near-UV LED-Based White Light

作者：Park Seung Hyok; Lee Kyoung Hwa; Unithrattil Sanjith; Yoon Ho Shin; Jang Ho Gyeom; Im Won Bin^*

来源：Journal of Physical Chemistry C, 2012, 116(51): 26850-26856.

DOI：10.1021/jp307192y

A red-emitting phosphor, CaY1-xEuxAl3O7 (CYA:Eu3+), was prepared by conventional solid-state reaction, and its structural properties were investigated by means of Rietveld refinement method and maximum entropy method using an X-ray source. XRD patterns confirm the tetragonal phase of CYA:Eu3+ phosphors. The photoluminescence properties of the samples were investigated for application to white light-emitting diodes (WLEDs). The emission spectrum is dominated by a red peak located at 616 nm due to the D-5(0) -%26gt; F-7(2) electric dipole transition of Eu3+ ions. Concentration quenching occurs when the Eu3+ concentration is about 0.35 and the critical transfer distance of the phosphor is also calculated. A white LED fabricated with blue, green, and CYA:Eu3+ red phosphor incorporated with an encapsulant in ultraviolet LEDs (lambda(max) = 396 nm) is discussed.

• 出版日期2012-12-27