共查询到20条相似文献,搜索用时 156 毫秒
1.
采用固相反应方法,制备了Er3+离子浓度为0.5 at.%,Yb掺杂浓度范围为0.0— 6.0 at.%的Er/Yb共掺激光玻璃,并对激光玻璃的吸收光谱和光致荧光光谱进行了分析.研究 结果显示,Yb3+掺杂对Er3+在980 nm附近的吸收起到了非常显著的 增强作用.在 980 nm的激光抽运下,激光玻璃在1530 nm处的光致发光强度随着Yb离子浓度 的增加而先增大后减小, 当Yb3+离子浓度为Er3+离子浓度6倍时光 致发光强度达到最大值.同时还发现了Yb3+对Er3+的光致荧光光谱 的展宽作用,并讨论了荧光光谱的展宽机理.
关键词:
Er/Yb共掺玻璃
光致发光
吸收光谱 相似文献
2.
通过对不同退火条件下Er/Yb共掺Al2O3薄膜光致荧光(PL)光谱的 系统分析,研究了高Er/Yb掺杂浓度所导致的晶体场变化对薄膜PL光谱的影响,并结合薄膜结构分析,探讨了Al2O3薄膜的结晶状态在Er3+激活、PL光谱宽化 中的作用及可能的物理机理.研 究结果表明:退火处理所导致的Er3+ PL光谱的变化与薄膜的微观状态之 间有着密 切的联系.在600—750℃范围内,薄膜呈非晶态结构,薄膜荧光强度的增加主要是薄膜内缺 陷减少所致;在800—900℃范围内,γ-Al2O3相的出现是导致荧 光强度明显增加的主 要原因;当退火温度为1000℃时,Er,Yb的大量析出致使荧光强度的急剧下降.此外,对PL 光谱线形分析表明,各子能级跃迁的相对强度变化是导致荧光光谱宽化的主要因素.
关键词:
Er/Yb共掺
2O3薄膜')" href="#">Al2O3薄膜
光致荧光 相似文献
3.
高温熔制Er3+,Yb3+离子掺杂CaO-Y2O3-Al2O3-SiO2系统玻璃,并进行微晶化处理,研究了微晶玻璃中Er3+离子的发光及上转换发光特性,分析了微晶玻璃上转换发光机理.结果表明:原始玻璃经热处理得到了Er,Yb:YAG微晶玻璃,微晶玻璃中Er3+离子在室温下4I13/2→4I15/2跃迁产生横盖1450—1650nm区间的超宽带荧光,荧光半高宽达180nm,这可能由于YAG微晶相中Er3+离子与玻璃相中残留Er3+离子的共同发光;Er3+与Yb3+离子局域基质声子能量的降低使微晶玻璃Er3+离子上转换发光强度与原始玻璃相比显著提高,绿光、红光上转换荧光强度比玻璃样品分别增强约7和3倍;微晶化后Er3+,Yb3+离子局域环境发生变化也导致微晶玻璃中Er3+离子绿光、红光上转换发光相对强度发生变化.
关键词:
铒
镱:钇铝石榴石
微晶玻璃
荧光光谱 相似文献
4.
采用柠檬酸燃烧法制备Er,Yb:(LaLu)2O3陶瓷粉体,用X射线衍射对其进行了物相鉴定,研究表明1 000℃时已经得到纯相的(LaLu)2O3。采用冷等静压-真空烧结法制备了Er,Yb:(LaLu)2O3和Er:(LaLu)2O3陶瓷,对陶瓷的结构和光谱性能进行了详细的研究,研究发现掺杂5% Yb3+和10% La3+样品的上转换发光强度与未掺Yb3+、La3+样品相比明显增大,根据上转换光谱显示较强发射峰位于564 nm和661 nm处,对应Er3+的4S3/2(2H11/2)→4I15/2能级跃迁和4F9/2→4I15/2能级跃迁,并讨论了Er3+-Yb3+的能量传递过程及其上转换发光机制。 相似文献
5.
采用固相反应方法制备了Er/Y共掺激光玻璃,其中Er3+浓度分别为0.5at%和1.0at%,所对应的Y3+浓度的变化范围分别为0.0at%—2.5at%和0.0at%—5.0at%.通过吸收光谱、瞬态和稳态光致发光光谱测量,研究了Y共掺对Er3+吸收截面、发射截面、荧光寿命和光致荧光特征的影响.研究结果表明:Y共掺杂导致1530nm附近的吸收峰宽化,对Er3+的吸收起到了一定的增强作用,并且这种宽化作用随着Er关键词:
Er/Y共掺玻璃
光致荧光
荧光寿命 相似文献
6.
7.
研究了Er3+/Yb3+共掺、Tm3+/Yb3+共掺、Er3+/Yb3+/Tm3+共掺碲酸盐玻璃在970nm抽运下的荧光光谱和上转换光谱性质,测试了Er3+离子的4I11/2和4I13/2能级荧光寿命变化情况.结果发现Er3+/Yb3+/Tm3+共掺碲酸盐玻璃的常规荧光谱线在1450—1700nm区域明显加宽,并在1630nm有一荧光峰,可能是Tm3+:1G4→3F2跃迁产生.上转换发光研究表明,由于碲酸盐玻璃声子能量低的缘故,三种共掺系统下都存在上转换发光现象.在Er3+/Yb3+/Tm3+共掺中,上转
关键词:
Er3+/Yb3+/ Tm3+共掺
碲酸盐玻璃
荧光
上转换光谱 相似文献
8.
9.
研究了Er3+离子掺杂钡镓锗玻璃的吸收光谱、拉曼光谱和上转换光谱.分析了Er3+离子在钡镓锗玻璃中的上转换发光机理.结果表明:玻璃的最大声子能量为828cm-1,紫外截止波长为275nm.采用800nm和980nmLD激发玻璃样品,在室温下观察到强烈的上转换绿光和红光发射.随着Er3+离子浓度的增加,绿光发光强度先增加后减小,而红光发光强度呈单调递增趋势.能量分析表明:800nmLD激发产生的绿光主要源于Er3+离子4I13/2能级的激发态吸收过程;红光发射主要源于Er3+离子4I13/2能级与4I11/2能级之间的能量转移过程.980nmLD激发产生的绿光主要源于Er3+离子4I11/2能级之间的能量转移过程;而红光发射主要源于Er3+离子4I13/2能级与4I11/2能级之间的能量转移过程和4I13/2能级的激发态吸收过程.通过量子效率分析,发现采用800nmLD激发Er3+离子掺杂浓度为1mol% 的样品时,上转换绿光发光效率最高.
关键词:
上转换发光机理
3+离子掺杂')" href="#">Er3+离子掺杂
钡镓锗玻璃 相似文献
10.
采用均相沉积法制备了不同Er3+离子浓度掺杂的Y2O3纳米晶, 应用XRD,SEM和PL光谱对该体系材料进行了表征.在Y2O3:Er3+纳米材料体系中, 观察和研究了Stokes及anti-Stokes PL谱强度与Er3+离子摩尔浓度变化的关系, 当Er3+离子浓度为2.0mol%时, anti-Stokes PL强度最强.粉末X
关键词:
氧化钇纳米晶
anti-Stokes PL
双光子吸收 相似文献
11.
12.
采用化学共沉淀法制备了系列Y1.98-2xYb2x Er0.02SiO5(0.00≤x≤0.15)以及Y1.736Yb0.24Er0.02Tm0.004SiO5上转换发光材料,比较了室温下Y1.98-2xYb2x Er0.02 SiO5 (x=0.00,0.08)样品在400—1600 nm范围内的吸收光谱,测量了所有样品在976 nm OPO激光器激发下的上转换发射光谱,以及Er3+离子4S3/2(4F9/2)→4I15/2,Tm3+离子1G4→3H6荧光衰减曲线和不同激发功率下的上转换蓝光发射强度,从而分析讨论了Er3+,Tm3+在Y2SiO5中的上转换发光机理.研究结果表明:在1250 ℃相对较低的温度下合成了X2型单斜晶系Y2SiO5 ∶Ln3+(Ln3+=Er3+,Yb3+,Tm3+),Yb3+的敏化显著增强了样品在976 nm附近的吸收能力,并大幅度加宽了该处的吸收带.分析上转换发射光谱发现:上转换绿光和红光强度都随着Yb3+浓度的增加先增强后减弱,但红光的猝灭浓度较高,归因于Er3+→Yb3+反向能量传递ETU4和Yb3+→Er3+正向能量传递ETU3过程的发生;上转换蓝光发射是三光子吸收过程,是通过Yb3+,Tm3+之间三次声子辅助的能量转移方式实现的.
关键词:
上转换
共沉淀
2SiO5∶Er3+')" href="#">Y2SiO5∶Er3+
3+')" href="#">Yb3+
3+')" href="#">Tm3+ 相似文献
13.
The 1 mol% Er3+- and 0-20 mol% Yb3+-codoped Al2O3 powders have been prepared by the nonaqueous sol-gel process using aluminum isopropoxide as precursor, acetylacetone as chelating agent, nitric acid as catalyzer, and hydrated erbium and ytterbium nitrate as dopant under isopropanol environment. The two crystalline types of doped Al2O3, γ and θ, and a stoichiometric compound, (Yb,Er)3Al5O12, were obtained for all the Er3+-Yb3+-codoped Al2O3 powders at the sintering temperature of 1000 °C. The maximal intensity of both the green and red up-conversion emissions centered at about 523, 545, and 660 nm was observed for the 1 mol% Er3+- and 10 mol% Yb3+-codoped Al2O3 powders. The intensity ratio of the red to green up-conversion emission (Ired/Igreen) increased with increasing the Yb3+ doping concentration for the Er3+-Yb3+-codoped Al2O3 powders. Furthermore, the intensity ratio of the green up-conversion emission at about 523 to 545 nm (I523/I545) was proportional to the Yb3+ doping concentration and pump electric current, which was associated with the elevated temperature of powders. 相似文献
14.
Weixiong You Fengqin LaiHonghui Jiang Jinsheng Liao 《Physica B: Condensed Matter》2012,407(7):1094-1098
Er3+ doped and Yb3+/Er3+ co-doped Y4Al2O9 phosphors are prepared by the sol-gel method. The effect of dopant concentration on the structure and up-conversion properties is investigated by X-ray diffraction (XRD) and photoluminescence, respectively. XRD pattern indicates that the sample structure belongs to monoclinic. Under 980 nm excitation, the green and red up-conversion emissions are observed and the emission intensities depended on the Yb3+ ion concentration. The green up-conversion emissions decrease with the increase of Yb3+ concentration, while red emission increases as Yb3+ concentration increases from 0 to 8 at% and then decreases at high Yb3+ concentration. The mechanisms of the up-conversion emissions are discussed and results shows that in Er3+ and Yb3+/Er3+ co-doped system, cross-relaxation (CR) and energy transfer (ET) processes play an important role for the green and red up-conversion emissions. 相似文献
15.
We have investigated the optical properties of sol-gel thin films of tin dioxide (SnO2) codoped with Er3+-Yb3+ as a function of Yb3+ concentration. The Judd-Ofelt model has been applied to absorption intensities of Er3+ (4f11) transitions to establish the so-called Judd-Ofelt intensity parameters: Ω2, Ω4, Ω6. Various spectroscopic parameters were obtained to evaluate their dependence and the potential of the samples as a laser material in the eye-safe laser wavelength (1.53 μm) as a function of Yb3+ concentration. An amelioration of the quality factor Ω4/Ω6 was found with Yb content. Both the IR photoluminescence (PL) intensity and the up-conversion emission, from Er3+ ion in SnO2, were found to increase with Yb concentration. We show that the Yb3+ ion acts as sensitizer for Er3+ ion and contributes largely to the improvement of the spectroscopic properties of SnO2:Er. The mechanism of up-conversion emission is discussed and a model is proposed. The results showed that sol-gel SnO2 is promising gain media for developing the solid-state 1.5 μm optical amplifiers and tunable up-conversion lasers. 相似文献
16.
采用共沉淀法制备了纳米晶ZrO2-Al2O3∶Er3+发光粉体.所制备的粉体室温下具有Er3+离子特征荧光发射,主发射在绿光,其中位于547 nm、560 nm的绿光最强,并得出稀土离子与基质之间有能量传递.对不同煅烧温度下的样品研究表明:因不同温度下所制得的样品晶相不同.研究了纳米晶ZrO2-Al2O3∶Er3+及ZrO2-Al2O3∶Er3+/Yb3+的上转换发光,并分析了上转换的跃迁机制.发现ZrO2-Al2O3∶Er3+的绿光为双光子过程,而ZrO2-Al2O3∶Er3+、Yb3+的上转换光谱中,红光和绿光也为双光子过程,而极弱的蓝光为三光子过程.讨论了Er3+的浓度猝灭现象.最适宜掺杂浓度的原子分数为2%(Er3+/Zr4+). 相似文献
17.
H. Wang 《Journal of luminescence》2009,129(2):110-113
Enhanced photoluminescence (PL) mechanism of Er3+-doped Al2O3 powders by Y3+ codoping at wavelength 1.53 μm has been investigated through PL measurements of 0.1 mol% Er3+- and 0-20 mol% Y3+-codoped Al2O3 powders prepared at a sintering temperature of 900 °C in a non-aqueous sol-gel method. PL intensity and lifetime of Er3+-Y3+-codoped Al2O3 powders composed of γ-(Al,Er,Y)2O3 and θ-(Al,Er,Y)2O3 phases increased with increasing Y3+-codoping concentration. The 10-20 mol% Y3+ codoping in 0.1 mol% Er3+-doped Al2O3 powders intensified the PL intensity by about 20 times, with a PL lifetime prolonged from 3.5 to 5.8 ms. A maximal increase of the optical activity of Er3+ in 0.1 mol% Er3+-Y3+-codoped Al2O3 powders about one order was achieved by 10-20 mol% Y3+ codoping. It is found that the improved PL properties for Er3+-Y3+-codoped Al2O3 powders are mainly attributed to enhanced optical activation of Er3+ in the Al2O3 by Y3+ codoping, and to the slightly increased radiative quantum efficiency of Er3+ in the Al2O3. 相似文献
18.
Optical parameters of Nd3+:Er3+:yb3+ co-doped borosilicate glasses and their energy transfers at high temperature 下载免费PDF全文
This paper reports that a series of Nd3+:Er3+:Yb3+ co-doped borosilicate glasses have been prepared and their absorption spectra measured. The J--O intensity parameters Ωk (k=2, 4, 6), spontaneous radiative lifetime τrad, spontaneous transition probability A, fluorescence branching ratio β and oscillator strength fed of the Nd3+ ions at room temperature are calculated based on Judd--Ofelt (J--O) theory. The temperature dependence of the up-conversion photoluminescence characteristics in a Nd3+:Er3+:Yb3+ co-doped sample is studied under a 978 nm semiconductor laser excitation, and the energy transfer mechanisms among Yb3+, Er3+ and Nd3+ ions are analysed. The results show that the J--O intensity parameters Ω2 increase when the Nd3+ concentration of the Nd3+:Er3+:Yb3+ co-doped borosilicate glasses increases. The possibility of spontaneous transition is small and lifetimes are long at levels of 4F5/2 and 4F3/2. The intensity of Nd3+ emissions at 595, 691, 753, 813 and 887 nm are markedly enhanced when the sample temperature exceeds 400 K. The reasons being the cooperation of the secondary sensitization from Er3+ to Nd3+ and the contribution of a multi-phonon. 相似文献
19.
研究了ErYb共掺的氟氧化物玻璃陶瓷的直接上转换敏化发光现象,发现其上转换机理主要是 Er3+与Yb3+离子间的能量传递上转换而不是Er3+离子 的步进多光子吸收.研究发现由于稀土离子优先富集到PbxCd1-xF2微晶中,形成数个稀土离子组成的耦合团,使其存在强烈的团簇效应,一方面导 致了上转换荧光非常强,另一方面也导致了上转换荧光随抽运激光功率的对数变化F-P曲线 存在逐
关键词:
直接上转换敏化
氟氧化物玻璃陶瓷
上转换合作辐射荧光 相似文献
20.
Sol-gel法制备Er3+-Yb3+共掺杂Al2O3粉末光致发光特性 总被引:8,自引:7,他引:1
采用异丙醇铝[Al(OC3H7)3]为前驱体,溶胶-凝胶(Sol-gel)法制备Er3+-Yb3+共掺杂Al2O3粉末.实验结果表明:900 ℃烧结的粉末为固溶Er3+、Yb3+的γ-(Al,Er,Yb)2O3相和少量θ-(Al,Er,Yb)2O3相的混合物.Er3+-Yb3+共掺杂Al2O3粉末具有中心波长为1.533 μm的光致发光(PL)特性.1 mol % Er3+和1 mol% Yb3+共掺杂的Al2O3粉末的PL强度较1 mol % Er3+掺杂提高2倍,半峰宽从53 nm增加到63 nm.随泵浦功率的提高,PL强度呈线性增加后渐呈饱和趋势. 相似文献