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Upconversion Luminescence from Ho3+ and Yb3+ Codoped α-NaYF4 Single Crystals
Jia-zhong Zhang,Hai-ping Xia*,Shuo Yang,Yong-zhang Jiang,Xue-mei Gu,Jian-li Zhang,Hao-chuan Jiang,Bao-jiu Chen
Author NameAffiliationE-mail
Jia-zhong Zhang Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Hai-ping Xia* Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China hpxcm@nbu.edu.cn 
Shuo Yang Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Yong-zhang Jiang Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Xue-mei Gu Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Jian-li Zhang Key laboratory of Photoelectronic Materials, Ningbo University, Ningbo 315211, China  
Hao-chuan Jiang Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315211, China  
Bao-jiu Chen Department of Physics, Dalian Maritime University, Dalian 116026, China  
Abstract:
The Ho3+/Yb3+ co-doped α-NaYF4 single crystal was grown successfully for the first time by a modified Bridgman method in which KF was used as assisting flux and a large temperature gradient (70-90 oC/cm) of solid-liquid interface was adopted. Upconversion emissions at green ~544 nm, red ~657 and ~751 nm were obtained under 980 nm laser diode excitation. The intensity at ~544 nm was much stronger than those of ~657 and ~751 nm. The mechanisms of the upconversion emissions were investigated by studying the relationship between the upconversion intensity and pump power. The optimized Yb3+ concentration was about 8.08 mol% when Ho3+ concentration was hold at about 1.0 mol%. The results showed that Ho3+/Yb3++ doped α-NaYF4 single crystal was a possible candidate upconversion material for the green solid-state laser.
Key words:  Ho3+/Yb3++, α-NaYF4
FundProject:
Ho3+/Yb3+→α-NaYF4单晶的上转换荧光光谱特性
张加忠,夏海平*,杨硕,姜永章,谷雪梅,章践立,江浩川,陈宝玖
摘要:
以KF作为助熔剂,采用固液界面温度梯度(70~90 oC/cm),通过改进的助熔剂-坩埚下降法从NaF-YF3熔体系统中生长出了Ho3+/Yb3+离子双掺杂的α-NaYF4单晶体. 在980 nm激光泵浦下可以观察到544 nm的上转换绿光和657和751 nm的上转换红光. 上转换的绿光强度明显强于上转换红光. 通过测量泵浦功率和上转换光的强度之间的关系研究了上转换发光的机理. 当Ho3+的掺杂浓度保持为1.0 mol%的情况下,Yb3+的浓度为8.08 mol%时上转换强度最强.
关键词:  Ho3+/Yb3+双掺杂α-NaYF4单晶,荧光强度,上转换
DOI:10.1063/1674-0068/28/cjcp1503042
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