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Development of Upconversion Material with Higher Efficiency

开发更高效率的上转换材料

基本信息

批准号：
03555166
负责人：
HIRAO Kazuyuki
金额：
$ 7.04万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

Some rare earth ions such as Er^<3+>, Ho^<3+>, Tm^<3+>, Pr^<3+> and Nd^<3+> when incorporated into a suitable host lattice, can upconvert infrared light to visible one. This upconversion phenomenon receives much interest, mainly because the visible source pumped in the near infrared light is required for optical devices which are used for the infrared light detector or the short wavelength upconversion laser. The remarkable result obtained in this study is following.1. Among fluoride glasses, we found that IPBL glass in the composition of 1ErF_3-48InF_3-24PbF_2-24BaF_2-3LaF_3, phonon energy of which is only as small as 270 cm^<-1> showed the highest upconversion efficiency at this moment.2. Another important objective is to demonstrate CW lasing at room temperature. It is considered that the optical fiber is a possible candidate of CW room temperature upconversion lasing material, because of its ability of light confinement over long lengths. We have found the CW room temperature upconversion lasing. Study of upconversion lasing of Er3+-doped fiber is attractive, since the pumping wavelength employed exists at around infrared (800nm) region where the high power laser diode is available and all-solid-state green devices based on a combination with the infrared laser diode might be applied for optical data storage, undersea communications and projection televisions.3. We have found that Tm^<3+>-doped fluoride glass showed blue and ultraviolet light at room temperature when pumped with a red krypton laser of 647 nm. Subsequently, We have found that Pr^<3+>-doped fluoride fibers exhibited green, yellow and red lights when pumped with infrared light of 800nm-1000nm wavelength.

一些稀土离子，如Er^&lt；3+&gt；，Ho^&lt；3+&gt；，Tm^&lt；3+&gt；，Pr^&lt；3+&gt；和Nd^&lt；3+&gt；当加入到合适的主体晶格中时，可以将红外光上转换为可见光。这种上转换现象引起了人们的极大兴趣，主要是因为用于红外探测器或短波长上转换激光器的光学器件需要在近红外光中泵浦的可见光。本研究取得的显著成果如下：1.在氟化物玻璃中，我们发现声子能量只有270 cm的1ErF_3-48InF_3-24PbF_2-24BaF_2-3LaF_3组成的IPBL玻璃此时的上转换效率最高。另一个重要的目标是演示室温下的连续激光。由于光纤具有长距离限制光的能力，被认为是一种可能的连续波室温上转换激光材料。我们发现了CW室温上转换激光。掺Er~(3+)光纤上转换激光的研究很有吸引力，因为泵浦波长位于高功率激光二极管所在的红外(800 Nm)附近，基于红外激光二极管的全固态绿光器件可能应用于光数据存储、海底通信和投影电视。我们发现在647 nm的红氪激光泵浦下，掺Tm~(2+)和~(3+)的氟化物玻璃在室温下表现出蓝光和紫外光。随后，我们发现在800 nm~1000 nm的红外光泵浦下，掺Pr~(2+)~(3+)&Gt~(3+)氟化物光纤出现绿光、黄光和红光。