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Effect of phosphor geometry on the luminous efficiency of high-power white light-emitting diodes with excellent color rendering property

机译:荧光体几何形状对显色性强的大功率白光发光二极管的发光效率的影响

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摘要

High-power white light-emitting diodes (LEDs) are fabricated by combining blue LEDs and green (Ba,Sr)_(2)SiO_(4):Eu~(2+) and red CaAlSiN_(3):Eu~(2+) phosphors with varying phosphor geometry. The white LED having separated the phosphor layer by the silicone gel layer between green and red phosphor layers shows superior optical properties. The luminous efficiency ((eta)_(L)) is improved by a decrease of reabsorption of green light by red phosphor owing to a difference among refractive indices. The white LED shows very high (eta)_(L) of 51 lm/W and a high color rendering index of 95 under 350 mA. In addition, improved luminous properties of the white LED including a separated phosphor layer are confirmed via ray-trace simulation.
机译:通过组合蓝色LED和绿色(Ba,Sr)_(2)SiO_(4):Eu〜(2+)和红色CaAlSiN_(3):Eu〜(2)制成大功率白色发光二极管(LED)。 +)具有变化的磷光体几何形状的磷光体。通过绿色和红色荧光粉层之间的硅凝胶层将荧光粉层隔开的白色LED显示出优异的光学性能。由于折射率之间的差异,通过减少红色荧光体对绿光的重吸收,提高了发光效率(η_(L))。白色LED在350 mA下显示非常高的η_(L)为51 lm / W,显色指数为95。另外,通过射线迹线仿真证实了包括分离的磷光体层的白色LED的改进的发光特性。

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