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Abstract
Sr4Si3O8Cl4 co-doped with Eu2+, Bi3+ were prepared by the high temperature reaction. The structure and luminescent properties of Sr4Si3O8Cl4:Eu2+, Bi3+ were investigated. With the introduction of Bi3+, luminescent properties of these phosphors have been optimized. Compared with Sr3.90Si3O8Cl4:0.10Eu2+, the blue-green phosphor Sr3.50Si3O8Cl4:0.10Eu2+, 0.40Bi3+ shows stronger blue-green emission with broader excitation in near-UV range. Bright blue-green light from the LED means this phosphor can be observed by the naked eye. Hence, it may have an application in near UV LED chips.
Highlights
White light-emitting-diodes (LEDs) have more advantages, such as energy saving, long lifetime, environmental friendly and high efficiency, compared with fluorescent lamps [1,2,3]
LEDs can be obtained by combining near UV LED chips with blue/green/red tricolor phosphors, in order
The structure of these phosphors was recorded by X-ray powder diffraction (XRD) using Cu
Summary
White light-emitting-diodes (LEDs) have more advantages, such as energy saving, long lifetime, environmental friendly and high efficiency, compared with fluorescent lamps [1,2,3]. Sci. 2015, 5 to obtain a higher efficiency white LED with appropriate color temperature and higher color-rendering index. This type of white LED is expected to dominate the market in the near future [4,5]. The phosphors for near UV LED chips should exhibit intense broad emission with broad excitation band in near UV range. Bi3+ is a very good sensitizer of luminescence in many hosts [10,11,12] It can efficiently absorb the UV-light and transfer the energy to the luminescent center, the excitation band would be broadened and the emission intensity of the luminescent center would be strengthened. Single blue-green LED was fabricated by combining the blue-green phosphor with ~395 nm emitting LED chips
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