用于白光LED的单一基质白光荧光粉Ca2SiO3Cl2:Eu2+，Mn2+的发光性质

用高温固相法合成了Eu²⁺，Mn²⁺共激活的Ca₂SiO₃Cl₂高亮度白色发光材料，并对其发光性质进行了研究. 该荧光粉在近紫外光激发下发出强的白色荧光，Eu^{2+中心形成峰值为419 nm和498 nm的特征宽带，通过Eu2+中心向Mn2+中心的能量传递导致了峰值为578 nm的发射，三个谱带叠加从而在单一基质中得到了白光. 激发光谱均分布在250—415 nm的波长范围，红绿蓝三个发射带的激发谱峰值分别位于385 nm，412 nm，370 nm和396 nm处，可以被InGaN管芯产生的紫外辐射有效激发. Ca₂SiO₃Cl₂:Eu2+，Mn2+是一种很有前途的单一基质白光LED荧光粉.}

Luminesce properties of the single white emitting phosphor Eu2+, Mn2+ co-doped Ca2SiO3Cl2

The intense white emitting phosphors Ca₂SiO₃Cl₂:Eu²⁺, Mn²⁺ were synthesized by traditional high temperature solid state reaction，and their luminesce properties were studied. The results indicate that the emission band consists of three peaks located at 425 nm，498 nm and 578 nm, respectively. The emission peaks at 425 and 498 nm originate from the transition 5d→4f of Eu²⁺ ions that occupy the two Ca²⁺ sites in the crystal of Ca₂SiO₃Cl₂, while the 578 nm emission is attributed to the energy transfer from Eu²⁺ ions to Mn²⁺ ions. The white light can be obtained by mixing the three emission colors of blue (425 nm), green(498 nm) and red(578 nm) in the single host. The excitation spectra of the three emission colors all extend from 250 nm to 420 nm, and their peaks positioned around 370 nm, 385 nm, 396 nm and 412 nm, respectively. The phosphor can be excited effectively by InGaN chip in the range of 350—410 nm. The experiment results show that the Ca₂SiO₃Cl₂: xEu²⁺, yMn²⁺ is a single host phosphor with superior properties for use in white light emitting diode (w-LED).