【作者】 温猛；

【导师】 石连升；

【作者基本信息】 哈尔滨理工大学 ， 材料加工工程， 2011， 硕士

【摘要】 本文采用高温固相法合成Yb³⁺、Er³⁺、Tm³⁺离子三掺的LiTaO₃多晶粉。测试了单掺Er³⁺离子、双掺Yb³⁺、Er³⁺离子及Yb³⁺、Tm³⁺离子和三掺Yb³⁺、Er³⁺、Tm³⁺离子的LiTaO₃多晶粉的紫外-可见吸收光谱,上转换稳态发射谱,上转换功率曲线及X-射线粉末衍射。多晶粉的X-射线粉末衍射谱测试结果表明掺杂离子后的多晶粉并没有新的峰产生,只是对原峰值的修改（增强或减弱）即可知:离子以取代的方式存在于晶格结构中,而不是存在于晶格间隙,并没有破坏晶体结构。对单掺Er³⁺离子、双掺Yb³⁺、Er³⁺离子及Yb³⁺、Tm³⁺离子和三掺Yb³⁺、Er³⁺、Tm³⁺离子的LiTaO₃多晶粉在980nm的激光下进行发光上转换功率曲线测试并不断调节各掺杂离子的浓度以便得到最好的效果,以便更好的分析出上转换的发光机制。1)利用波长为980nm的激光器对Er:LiTaO₃样品进行激发,观察到了可见光区较强的上转换绿光发射和很弱的上转换红光发射,且随着Er³⁺离子浓度的增加,上转换红、绿光的发射强度都有相应的增加。2)利用波长为980nm的激光器对Er:Yb:LiTaO₃样品进行激发,观察到了可见光区较强的上转换绿光发射和很弱的上转换红光发射且随着Yb³⁺离子浓度的提高,上转换红、绿光的发射强度都有一定程度的增加,但上转换红光发射强度增加的幅度明显要大于上转换蓝光发射强度增加的幅度。550nm附近上转换绿光输出源自于Er³⁺离子的2H11/2/4S3/2能级跃迁到基态⁴I_15/2过程中能量输出,而660nm附近上转换红光输出来源于Er³⁺离子的⁴F_9/2能级跃迁到基态⁴I_15/2能级的能量输出。3)对Yb:Er:Tm:LiTaO₃多晶粉在980nm样品进行激发,当掺杂能浓度达到1Yb:6Er:1Tm:LiTaO₃时上转换白光输出,450nm附近上转换蓝光的输出,产生上转换蓝光的Tm³⁺离子1G4态的布居主要来自双光子同时吸收过程。而单光子上转换红光,则由Tm³⁺和Er³⁺离子之间的交叉驰豫过程参与产生,即³F_2/3(Tm³⁺)+⁴I_15/2(Er³⁺)→³H₆(Tm³⁺)+⁴I_9/2(Er³⁺)。通过测试晶体的紫外可见吸收光谱,讨论了掺杂离子对晶体的影响机理,与纯LiTaO₃相比掺杂三价稀土离子促使基础吸收边相对发生紫移。本文研究中首次在三掺LiTaO₃中获得白光输出,这在国内外未见报道过,在今后LiTaO₃科研贡献中起到一定作用。更多还原

【Abstract】 This paper uses high-temperature solid-phase synthesis method,Yb³⁺and Tm³⁺ions Er³⁺the three mixed LiTaO₃ more crystal powder, first in the laboratory system three LiTaO₃ more crystal powder mixed, and achieved good optical properties. Tested LiTaO₃: Er³⁺/Yb³⁺/Tm³⁺,LiTaO₃: Er³⁺,LiTaO₃: Er³⁺/Yb³⁺ more crystal powder ultraviolet-visible absorption spectrum, the steady-state emission spectrum, the conversion on conversion power curve and X-ray powder diffraction.Through the test multiple crystal powder X-ray powder diffraction diagram analysis doped ions in crystals in the placeholder situation, and on the original lattice structure change, Through multiple sets of XRD test results contrast can significantly know that doping ions crystal powder and do not new peak produce, only on the original peak modifications （increase or decrease） can know that ion to replace the way exists in the lattice structure, but does not exist in a lattice clearance, without disrupting the crystal structure.Through the test of crystal uv-visible spectra and ir discussed doped ion to the crystal photorefractive effect on the performance of mechanism, Through the LiTaO₃: Er³⁺/Yb³⁺/Tm³⁺ultraviolet absorption spectrum testing, testing results show that rare earth doped trivalent ion prompted foundation absorption occurs purple purple edge relative move move.For LiTaO₃: Er³⁺/Yb³⁺/Tm³⁺;LiTaO₃:Er³⁺;LiTaO₃: Er³⁺/Yb³⁺more crystal powder in 980nm laser under shine on conversion power curve tests and constantly adjust every doped ion concentration in order to get the best effect, in order to better analyze the upxonverted luminous mechanism. By using the laser wavelength for 980nm for LiTaO₃: Er³⁺samples stimulate, and observed visible area strong upxonverted green light transmission and very weak upxonverted red, along with Er³⁺ launch the increase of the concentration of the ions, upxonverted red and green launch strength has a corresponding increase. By using the laser wavelength for 980nm for LiTaO₃: Er³⁺/Yb³⁺ samples stimulate, and observed visible area strong upxonverted blu-ray launch and very weak upxonverted red light emission and with the increase of the concentration of the Yb³⁺ ions, upxonverted red, blue launch strength have a certain degree of increased, but the upxonverted red launch strength increasing range obviously than upxonverted blu-ray launch strength increasing range. 530nm - 550nm near upxonverted green light output originated from Er³⁺ ions ²H_11/2/⁴S_3/2 level ground warp to ⁴I_15/2 process energy output, and 660nm near upxonverted red output comes from Er³⁺ ions ⁴F_9/2 level ground warp to ⁴I_15/2 level of energy output. Yb:Er:Tmcrystal powder in 980nm LiTaO₃ more under the white upxonverted laser power curve test and analysis of the white light upxonverted light-emitting mechanism, blue hair spectral band is absorbed by the two-photon simultaneously on conversion process produces, and single photon upxonverted red, by the Tm³⁺and Er³⁺ions the intersection of chi and processes involved in produce, namely: ³F_2/3(Tm³⁺)+⁴I_15/2(Er³⁺)→³H₆(Tm³⁺)+⁴I_9/2(Er³⁺).This paper studies the first in three mixed LiTaO₃ gain white light output, this not seen at home and abroad have been reported, in the future research contributions LiTaO₃ plays a role.更多还原