摘要
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,Eu2+中心形成峰值为419nm和498nm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578nm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—415nm的波长范围,红绿蓝三个发射带的激发谱峰值分别位于385nm,412nm,370nm和396nm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.
The intense white emitting phosphors Ca2SiO3Cl2：Eu^2＋,Mn^2＋ were synthesized by traditional high temperature solid state reaction, and their luminesee 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 Eu^2＋ ions that occupy the two Ca^2＋ sites in the crystal of Ca2SiO3Cl2 ,while the 578 nm emission is attributed to the energy transfer from Eu^2＋ ions to Mn^2＋ 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：xEu^2＋,yMn^2＋ is a single host phosphor with superior properties for use in white light emitting diode （w-LED）.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第1期546-550,共5页
Acta Physica Sinica
基金
河北省科学技术发展基金(批准号:51215103b)资助的课题~~
