Abstract
Figure 1. XRD patterns of the Ca8Mg(SiO4)4Cl2:Eu, Mn phosphors heat-treated at different temperatures ((a) 900 C, (b) 1000 C, (c) 1100 C, (d) 1200 C). Since visible LEDs were first reported in the 1960s, they have been widely studied as a backlight for liquid crystal displays (LCD) and solid-state lighting. In particular, the efficiency of white LED lighting is higher than that of the incandescent lamps, and is currently competitive with fluorescent lamps. LEDs are a type of diode with a P-N junction semiconductor. The most common method for generating a white LED for solid state lighting is to combine a blue LED with a yellow phosphor, a technique developed by Nichia. The white LEDs were composed of blue LEDs emitting at 460 nm, and cerium doped yittrium aluminum garnet (YAG:Ce) phosphor has a yellow emission band. In the present work, we have synthesized a Ca8Mg(SiO4)4Cl2: Eu, Mn yellow phosphor. The Mn co-doped Ca8Mg(SiO4)4 Cl2:Eu phosphor is an efficient phosphor which emits yellow emission band (550 nm) through excitation under the ultraviolet and blue light. The photoluminescence excitation and emission spectra, and the temperature dependence of Ca8Mg(SiO4)4Cl2: Eu, Mn were measured. The optical properties of LEDs fabricated by combining UV chips (λem=405 nm) with Ca8Mg (SiO4)4Cl2:Eu, Mn phosphors were measured.
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