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1.
Green and red up-conversion emissions and thermometric application of Er^3+-doped silicate glass 总被引:2,自引:0,他引:2
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The green and red up-conversion emissions centred at about 534, 549 and 663 nm of wavelength, corresponding respectively to the ^2H11/2 → ^4I15/2, ^4S3/2 → ^4I15/2 and ^4F9/2 → ^4I15/2 transitions of Er^3+ ions, have been observed for the Er^3+-doped silicate glass excited by a 978 nm semiconductor laser beam. Excitation power dependent behaviour of the up-conversion emission intensity indicates that a two-photon absorption up-conversion process is responsible for the green and red up-conversion emissions. The temperature dependence of the green up-conversion emissions is also studied in a temperature range of 296-673 K, which shows that Er^3+-doped silicate glass can be used as a sensor in high-temperature measurement. 相似文献
2.
Host dependent thermal stability and frequency upconversion of Er^3+-doped heavy metal oxyfluoride germanate glasses
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The upconversion properties of Er^3+-doped heavy metal oxyfluoride germanate glasses under 975 nm excitation have been investigated. The intense green (551 and 529 nm) and relatively weak red (657 nm) emissions corresponding to the transitions ^4S3/2→^4I15/2, ^2H11/2→^4 I15/2 and ^4F9/2 →^4I15/2, respectively, were simultaneously observed at room temperature. The content of PbF2 has an important influence on the upconversion luminescence emission. With increasing content of PbF2, the intensities of green (529 nm) and red (657 nm) emissions increase slightly, while the green emission (551 nm) increases markedly. These results suggest that PbF2 has an influence on the green (551 nm) emission more than on the green (529 nm) and red (657 nm) emissions. 相似文献
3.
High Efficiency Infrared-to-Visible Upconversion Emission in Er^3+,Yb^3+, and Ho^3+ Codoped Tellurite Glasses
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A novel method of codoping the Er^3+, Yb^3+, and Ho^3+ ions in tellurite glasses is demonstrated to obtain a high efficiency of infrared-to-visible upconversion. Three intense emission bands observed in Er^3+, Yb^3+, and Ho^3+ codoped tellurite glasses centred at 525, 547, and 657nm correspond to Er^3+: ^2H11/2 -4 ^4I15/2, Er^3+: ^4S3/2 →^4I15/2+Ho^3+: ^5S2(^5F4) → ^5Is, and Er^3+: ^4Sa/2 → ^4I15/2+Ho^3+: ^5F5 → ^5Is transitions, respectively. No visible upconversion quenching phenomenon is observed when three rare-earth ions are codoped together in tellurite glasses. In contrast, the upconversion intensity of red and green emissions in Er^3+, Yb^3+, and Ho^3+ codoped glasses is enhanced largely when compared with Er^3+ /Yb^3+-codoped glasses. The dependence of upconversion intensities on excitation power and the possible upconversion mechanisms are evaluated. The three emissions are based on two-photon absorption processes. 相似文献
4.
Structural and Upconversion Fluorescence Properties of Er^3+/Yb^3+-Codoped Lead-Free Germanium-Bismuth Glass
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We study the structural and infrared-to-visible upconversion fluorescence properties of Er^3 /yb^3 -codoped leadfree germanium-bismuth glass. The structure of lead-free germanium-bismuth-lanthanum glass is investigated by peak-deconvolution of F~aman spectroscopy. Intense green and red emissions centred at 525, 546, and 657nm,corresponding to the transitions ^2H11/2 → 4I15/2, ^4S3/2 → 4I15/2, and 4F9/2 → 4I15/2, respectively, are observed at room temperature. The quadratic dependence of the 525, 546, and 657nm emissions on excitation power indicates that a two-photon absorption process occurs under 975nm excitation. 相似文献
5.
The upconversion luminescence and dynamics in Er^3+ /Yb^3+ codoped nanocrystalline yttria (7-65 nm) are studied under 980-nm pulsed laser excitation, It is found that the red emission of ^4F9/2-^4I15/2 and the green emission of ^2H11/2/^4S3/2 in nanoparticles with lower concentration of Yb^3+ result from a two-photon excitation, In nanocrystals with higher Yb^3+ concentration, the red emissions from a two-photon excitation, while the green emissions from a three-photon excitation, The luminescence dynamics indicates that as the particle size decreases, both the rise and the decay time constants become shorter, As the size decreases to several nanometres, the rise process nearly disappears, suggesting that the upconversion luminescence originates mainly from self-excitation of Er^3+, instead of the energy transfer of Yb^3+→ Er^3+. 相似文献
6.
Frequency upconversion fluorescence property of Er^3 -doped oxychloride germanate glass is investigated. Intense green and red emissions centred at 525, 546, and 657nm, corresponding to the transitions ^2H11/2→4I15/2,^4S3/2→^4I15/2, and ^4F9/2→^4I15/2, respectively, were simultaneously observed at room temperature. The quadratic dependence of the 525, 546, and 657nm emissions on excitation power indicates that a two-photon absorption process occurs under 975 nm laser diode (LD) excitation. The Raman spectrum investigation indicates that oxychloride germanate glass has the maximum phonon energy at-805cm^-1. The thermal stability of this oxychloride germanate glass is evaluated by differential scanning calorimetry, and thermal stability factor AT(△T = Tx -Tg) is 187℃. Intense upconversion luminescence and good thermal stability indicate that Er^3 -doped oxychloride germanate glass is a promising upconversion laser material. 相似文献
7.
The upconversion properties of Tm^3 /Yb3 -codoped lead chloride tellurite glass under 980hm excitation were investigated. The intense blue (476nm) emission and weak red (649 nm) emission corresponding to the ^1G4→4 ^3H6 and ^1G4→^3H4 transitions of Tm^3 ions, respectively, were simultaneously observed at room temperature. The dependence of upconversion intensities on excitation power and the possible upconversion mechanisms are evaluated. The intense blue upconversion luminescence of Tm^3 /Yb^3 -codoped lead chloride tellurite glass can be used as potential host material for the development of blue upconversion optical devices. 相似文献
8.
Improved Fluorescence from Tm^3+/Er^3+/Ce^3+ Triply Doped Bismuth-Silicate Glasses for S+C-bands Amplifiers
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Fluorescence of Tm^3+/Er^3+ codoped bismuth-silica (BS) glasses and the sensitization of Ce^3+ are investigated, It shows that Ce^3+ codoping with Tm^3+/Er^3+ in BS glasses results in a quenching of Tm^3+ ion emission from ^3F4 to the ^3H6 level. Consequently, the 1.47μm emission occurs after the population inversion between the ^3H4 and ^3F4 levels. Furthermore, the codoped glasses show the broad emission spectra over the whole S and C bands with full-width at half-maximum (FWHM) up to about 119nm, as it combines 1.55μm emission band of Er^3+ with 1.47μm emission band of Tm^3+ under 800hm excitation. 相似文献
9.
The upconversion fluorescence emission of Er3 -doped 60GeO2-2OPbO-2OPbF2 glass was experimentally investigated under the pump of 976-nm laser diode. The results reveal the existence of intense emission bands centred around 524, 545, and 657nm at room temperature. The green emission at 524 and 545nm is due to the 4S3/2 2 Hll/2→ 4I15/2 transition and the red emission of 657nm originates from the 4F9/2-→4I15/2 transition of Er3 . The quadratic dependence of the green and red emissions on excitation power indicates that a two-photonabsorption process occurs under the 976-nm excitation. The excited- state absorption from 4I ll/2 and the cross relaxation between two Er3 ions in the 4I ll/2 state contribute to the green emission. The red emission at 657nm is attributed to the excited-state absorption and cross relaxation processes in the 4I13/2 level as well as the 4S3/2 level nonradiative transition of Er3 . 相似文献
10.
Er^3 -doped strontium-lead-bismuth glasses for developing potential upconversion lasers have been fabricated and characterized. Under 975 nm excitation, intense green and red emissions centred at 525, 546, and 657nm,corresponding to the transitions ^2H11/2 → ^4I15/2, ^4S3/2 → ^4I15/2, and ^4F9/2 → ^4I15/2, respectively, were observed at room temperature. The upconversion mechanisms are discussed based on the energy matching and quadratic dependence on excitation power, and the dominant mechanisms are excited state absorption and energy transfer upconversion for 525 and 546nm emissions, and energy transfer upconversion for 657nm emission. 相似文献
11.
The energy transfer phenomenon has been studied from Tb3+ → Nd3+ and Tb3+ → Ho3+ in DMSO. A diffusion limited dipole-dipole mechanism of energy transfer is suggested for both systems. At high acceptor concentrations, Pda depends linearly on C2 consistent with the Fong and Diestler theory of energy transfer. However, at low acceptor concentrations the observations of time evolutions of Tb3+ luminescence decay following flash excitation has enabled us to examine diffusion limited energy transfer from Tb3+ to Nd3+ and Tb3+ to Ho3+ in DMSO. 相似文献
12.
报道外延生长的多激活中心掺杂的红色单晶荧光体Eu^3+:Sm^3+:Cr^3+:YAG,其直径达到54mm,荧光色坐标为x=0.6137,y=0.3738,相当于波长λ=599mm的红色荧光,具有较高的色饱和度。这种单晶材料具有委好的抗电子束灼伤能力,在入射能量达到10^5W/m^2时无发光猝灭现象,是一种较理想的红色单晶荧光材料。 相似文献
13.
The excitation spectra of the Nd3+, Sm3+, Dy3+, Ho3+, Er3+ and Tm3+ emission in the sodium-compensated CaGa2S4 host lattice, a sulfide with wide band gap, contain an intense band below the absorption edge. Comparison of the energy of its maximum with thermodynamic data and correlations to Jørgensen's refined spin-pairing theory predictions allow one to ascribe this band to a charge transfer transition ending onto 4f orbitals. The irregular variation within the rare earth series contrasts with the monotonic variation of the absorption edge in stoichiometric rare earth sulfides (e.g. NaLnS2), associated with interband transitions. 相似文献
14.
制备了不同 Al(PO3)3含量的掺铥系列氟磷酸盐玻璃,研究了其结构、热稳定性和光谱性质. 研究了不同摩尔百分数 Al(PO3)3掺杂下 Cr3+/Tm3+/Ho3+共掺氟磷酸盐玻璃在 2.0μm 处的发光特性. 并且用Judd-Ofelt理论计算了强度参量,并由此计算了激发能级的自发辐射跃迁速率、辐射寿命、荧光分支比等光谱参量. 结果表明,随着 Tm3+浓度增加,2.0μm 处发光的强度逐渐增强. 证明了Tm3+(3F4) →Ho3+(5I7)能量转移是非常有效的,并与掺杂浓度有关.
关键词:
氟磷酸盐玻璃
能量传递
荧光光谱
吸收光谱 相似文献
15.
16.
利用溶胶-凝胶法制备了Bi3+、Yb3+单掺和共掺的Gd2O3荧光粉。研究了Gd2-x-yO3: Bix3+,Yby3+的制备条件并表征了Gd2-x-yO3: Bix3+,Yby3+的荧光性能。 由于Gd2O3: Bi3+,Yb3+中Bi3+对Yb3+的能量传递,Gd2O3: Bi3+,Yb3+在Bi3+的特征激发峰338 nm激发时,可以产生Yb3+的900~1 100 nm近红外特征发射和Bi3+的400~700 nm特征发射的两个波段光谱。所制备的Gd2O3: Bi3+,Yb3+荧光材料可将太阳光谱中硅太阳能电池吸收较弱的300~400 nm光转换成有较强吸收的500~700 nm 和1 000 nm附近的近红外光子,提高硅太阳能电池的光伏效率。 相似文献
17.
18.
This paper reports on a study of cross-luminescence in barium fluoride crystals doped by a variety of impurities (K+, Cd2+, Y3+, Yb3+, La3+). It is shown that doping of the crystal with a trivalent impurity gives rise to the formation of an additional cross-luminescence
band peaking at 7.5 eV, the intensity of this band increasing with increasing impurity concentration.
Original Russian Text ? A.S. Myasnikova, E.A. Radzhabov, A.V. Egranov, 2008, published in Fizika Tverdogo Tela, 2008, Vol.
50, No. 9, pp. 1582–1584. 相似文献
19.
对Ce^3 :Eu^3 :Cr^3 :Sm^3 :YAG外延层中的荧光敏经现象进行了报道和分析,在较高浓度的Ce^3 离子掺杂时,外处层在蓝色、绿色波段出现了新的荧光谱线,可解释为在Ce^3 离子每化作用下,Eu^3 离子产生了由高位激发态能级^5Di(i=1,2,3)直接到基态能级^7Fj(j=0,1,2,3)的辐射跃迁过程,并且这种Ce^3 :Eu^3 :Cr^3 :Sm^3 :YAG外延层还是一种新颖的白色单晶荧光材料。 相似文献
20.
采用高温固相法在1 000℃下煅烧6 h合成了Sc VO4∶Eu3+,Bi3+,Al3+荧光粉。使用X射线粉末衍射仪和扫描电镜对样品的结构和形貌进行了表征,采用荧光分光光度计研究了样品的发光性质。用315 nm波长激发Sc VO4∶Eu3+,Bi3+,Al3+样品时,样品在590~620 nm范围内发射强烈的橙红光,最大发射峰位于615nm。少量Al3+的掺入可以增强Sc VO4∶Eu3+,Bi3+荧光粉的发光,而掺入过量Al3+时会使Sc VO4∶Eu3+,Bi3+荧光粉的发光变弱。当Al3+在Sc VO4∶Eu3+,Bi3+中的摩尔分数达到4%时,样品的发光最强且其发光强度较未掺杂Al3+的样品提高了约30%。 相似文献