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白光LED用LiSrBO3∶Sm^3+材料的光谱特性(英文) 被引量:6
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作者 王志军 陆伟 +3 位作者 李盼来 杨志平 郭庆林 傅广生 《光子学报》 EI CAS CSCD 北大核心 2010年第5期913-917,共5页
采用固相法制备了一种新型的白光LED用LiSrBO3∶Sm3+红色发光材料,并研究了材料的光谱特性.材料的激发与发射光谱显示其能够被404nm近紫外光激发,发射599nm红光,很好的符合近紫外光激发下白光LED的需要.研究了Sm3+浓度对材料发射强度的... 采用固相法制备了一种新型的白光LED用LiSrBO3∶Sm3+红色发光材料,并研究了材料的光谱特性.材料的激发与发射光谱显示其能够被404nm近紫外光激发,发射599nm红光,很好的符合近紫外光激发下白光LED的需要.研究了Sm3+浓度对材料发射强度的影响,发现Sm3+浓度为3mol%时,强度最大.添加Na+或K+也可提高LiSrBO3∶Sm3+材料的发射强度. 展开更多
关键词 白光发光二极管 lisrbo3∶Sm3+ 光谱特性
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Ce^(3+)激活的LiSrBO_3材料发光特性及晶体学格位研究 被引量:7
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作者 李盼来 王志军 +2 位作者 王颖 杨志平 郭庆林 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2009年第8期1487-1491,共5页
采用固相法制备了蓝白色LiSrBO3∶Ce3+材料.测得LiSrBO3∶Ce3+材料的发射光谱为一个主峰位于436 nm的非对称单峰宽谱;监测436 nm发射峰时所得材料的激发光谱为一个主峰位于369 nm的宽谱.利用Van Uitert公式计算了Ce3+取代LiSrBO3中Sr时... 采用固相法制备了蓝白色LiSrBO3∶Ce3+材料.测得LiSrBO3∶Ce3+材料的发射光谱为一个主峰位于436 nm的非对称单峰宽谱;监测436 nm发射峰时所得材料的激发光谱为一个主峰位于369 nm的宽谱.利用Van Uitert公式计算了Ce3+取代LiSrBO3中Sr时所占晶体学格位,得出433 nm发射带归属于九配位的Ce3+发射,469 nm发射带起源于八配位的Ce3+发射.研究了Ce3+浓度对LiSrBO3∶Ce3+材料发光强度的影响,研究结果显示,随着Ce3+浓度的增大,发光强度呈现先增大后减小的趋势,在Ce3+摩尔分数为3%时到达峰值,根据Dexter理论,其浓度猝灭机理为电偶极-偶极相互作用.引入Li+,Na+和K+作为电荷补偿剂时发现,LiSrBO3∶Ce3+材料的发射光谱强度均得到了明显的增强.利用InGaN管芯(370 nm)激发LiSrBO3∶Ce3+材料时,获得了很好的蓝白光发射,色坐标为(x=0.289,y=0.293). 展开更多
关键词 白光LED lisrbo3∶Ce3+ 晶体学格位 发光特性
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Dy^(3+)激活的LiSrBO_3材料光谱特性研究 被引量:3
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作者 王志军 李盼来 +4 位作者 庞立斌 杨志平 郭庆林 傅广生 李旭 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2010年第1期18-21,共4页
研究了Dy^(3+)激活的LiSrBO_3材料的光谱特性。材料的发射光谱为一多峰宽谱,主峰分别为486,578和668 nm;监测578 nm发射峰时所得材料的激发光谱为一多峰宽谱,主峰分别为331,368,397,433,462和478 nm。研究了Dy^(3+)掺杂浓度对材料发射... 研究了Dy^(3+)激活的LiSrBO_3材料的光谱特性。材料的发射光谱为一多峰宽谱,主峰分别为486,578和668 nm;监测578 nm发射峰时所得材料的激发光谱为一多峰宽谱,主峰分别为331,368,397,433,462和478 nm。研究了Dy^(3+)掺杂浓度对材料发射光谱的影响,结果显示,随Dy^(3+)浓度的增大,黄、蓝发射峰强度比(Y/B)逐渐增大;同时材料的发光强度随Dy^(3+)浓度的增大呈现先增大后减小的趋势,在Dy^(3+)浓度为3 mol%时到达峰值,其浓度猝灭机理为电偶极·偶极相互作用。引入Li^+,Na^+和K^+均可提高材料的发射强度。 展开更多
关键词 DY^3+ LiSrBO_3 光谱特性
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Spectral Characteristics of LiSrBO_3:Tb^(3+) Green Phosphor 被引量:1
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作者 LI Pan-lai WANG Zhi-jun YANG Zhi-ping GUO Qing-lin 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2009年第5期610-613,共4页
LiSrBO3:Tb^3+ green phosphor was synthesized by means of a solid state reaction and its spectral characteristics were studied. The emission spectrum of LiSrBO3:Tb^3+ consists of four major bands at 486, 544, 595 a... LiSrBO3:Tb^3+ green phosphor was synthesized by means of a solid state reaction and its spectral characteristics were studied. The emission spectrum of LiSrBO3:Tb^3+ consists of four major bands at 486, 544, 595 and 620 nm under the excitation of near ultraviolet irradiation, which are originated from the ^5Da→^7F6, ^5D4→^7F5, ^5D4→^7F4 and ^5D4→^7F3 characteristic transitions of Tb^3+, respectively. Monitored at 544 nm, the excitation spectrum of the phosphor extends from 220 nm to 390 nm, with the excitation peaks centered at 242, 277, 368 and 381 nm, respectively. The effect of Tb^3+ concentration on the emission intensity of LiSrBO3:Tb^3+ was also investigated. The results show that firstly the intensity increases with increasing Tb^3+ concentration, reaches a maximum value at 3%(molar fraction) Tb^3+ and then decreases, showing a concentration self-quenching, whose mechanism is proposed as a d-d interaction based on Dexter theory. The emission intensity of LiSrBO3:Tb^3+ was enhanced by co-doping Li^+, Na^+ and K^+. 展开更多
关键词 lisrbo3:Tb^3+ Green phosphor Spectral characteristics
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A novel yellow phosphor for white light emitting diodes
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作者 王志军 李盼来 +2 位作者 杨志平 郭庆林 李旭 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第1期515-519,共5页
This paper reports that a novel yellow phosphor, LiSrBO3:Eu2+, was synthesized by the solid-state reaction. Thc excitation and emission spectra indicate that this phosphor can be effectively excited by ultraviolet ... This paper reports that a novel yellow phosphor, LiSrBO3:Eu2+, was synthesized by the solid-state reaction. Thc excitation and emission spectra indicate that this phosphor can be effectively excited by ultraviolet (360 and 400 nm) and blue (425 and 460 nm) light, and exhibits a satisfactory yellow performance (565 nm). The role of concentration of Eu2+ on the emission intensity in LiSrBO3 is studied, and it is found that the critical concentration is 3 mol%, and the concentration self-quenching mechanism is the dipole-dipole interaction according to the Dexter theory. White light emitting diodes were generated by using an InGaN chip (460 nm or 400 nm) with LiSrBO3:Eu2+ phosphor, the CIE chromaticity is (x = 0.341, y =0.321) and (x = 0.324, y = 0.318), respectively. Therefore, LiSrBOa:Eu^2+ is a promising yellow phosphor for white light emitting diodes. 展开更多
关键词 LUMINESCENCE white light emitting diodes lisrbo3:Eu^2+
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