Melilite-Structure CaYAl3O7:Eu3+ Phosphor: Structural and Optical Characteristics for Near-UV LED-Based White Light
- Authors
- Park, Seung Hyok; Lee, Kyoung Hwa; Unithrattil, Sanjith; Yoon, Ho Shin; Jang, Ho Gyeom; Im, Won Bin
- Issue Date
- 27-12월-2012
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, v.116, no.51, pp.26850 - 26856
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHYSICAL CHEMISTRY C
- Volume
- 116
- Number
- 51
- Start Page
- 26850
- End Page
- 26856
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/106633
- DOI
- 10.1021/jp307192y
- ISSN
- 1932-7447
- Abstract
- 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) -> 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.
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