Title: Ca(2)PO(4)Cl : Eu(2+): an intense near-ultraviolet converting blue phosphor for white light-emitting diodes
Authors: Chiu, Yi-Chen
Liu, Wei-Ren
Chang, Chun-Kuei
Liao, Cheng-Chun
Yeh, Yao-Tsung
Jang, Shyue-Ming
Chen, Teng-Ming
Department of Applied Chemistry
Issue Date: 1-Jan-2010
Abstract: A blue phosphor Ca(2)PO(4)Cl : Eu(2+) was synthesized by solid state reaction and evaluated as a candidate for white LEDs. The luminescent intensity of Ca(2)PO(4)Cl : Eu(2+) was found to be 128% under excitation at 380 nm, 149% under 400 nm, and 247% under 420 nm, as high as that of BaMgAl(10)O(17) : Eu(2+). Furthermore, Ca(2)PO(4)Cl : Eu(2+) reveals high quantum efficiency and excellent thermal stability. By utilizing a mixture of blue-emitting Ca(2)PO(4)Cl : Eu(2+), green-emitting (Ba, Sr)(2)SiO(4) : Eu(2+) and redemitting CaAlSiN(3) : Eu(2+) as light converters, an intense white GaN-based n-UV-LED (400 nm) was fabricated to exhibit an excellent color-rendering index R(a) of 93.4 at a correlated color temperature of 4590 K. Based on the results, we are currently evaluating the potential application of Ca(2)PO(4)Cl : Eu(2+) as a blue-emitting near-UV convertible phosphor.
URI: http://dx.doi.org/10.1039/b920610h
ISSN: 0959-9428
DOI: 10.1039/b920610h
Volume: 20
Issue: 9
Begin Page: 1755
End Page: 1758
Appears in Collections:Articles