WO3对掺铒碲酸盐玻璃的光谱性质的影响

为了满足光通信技术发展对光放大器材料的带宽要求,采用固相法制备了掺铒碲钨酸盐玻璃,研究了其光谱性质和热稳定性。用Judd-Ofelt理论计算了光谱的强度参量,根据McCumber理论计算了受激发射截面,其最大受激发射截面为1.85×10-20cm2,荧光半峰全宽最大值为104nm;用差热法分析了玻璃的热稳定性,析晶温度和转变温度之差最大值为131℃。结果表明,掺铒碲钨酸盐玻璃是一种良好的宽带放大器材料。     

新型掺铒碲酸盐玻璃光谱性质和热稳定性研究

采用高温熔融法制备了掺Er3 :TeO2-B2O3-SiO2-Na2O系列玻璃样品.对样品吸收光谱、发射光谱、差热曲线和Er3 :4I13/2能级的荧光寿命进行了测试和分析.计算得到Er3 的J-O强度参数Ωλ(λ=2,4,6),讨论了SiO2的含量对Er3 在该系列玻璃样品中发光性能的影响.结果表明,SiO2的引入有效提高了玻璃材料的有效发射带宽和热稳定性,有效抑制了材料的荧光上转换效应.同时,计算得到Er3 :4I13/2→4I15/2能级的量子效率为ηmax＝63%.     

Luminescent properties of Eu~（3＋） doped Gd_2WO_6 and Gd_2（WO_4）_3 nanophosphors prepared via co-precipitation method

Eu3+ doped Gd2WO6 and Gd2(WO4)3 nanophosphors with different concentrations were prepared via a co-precipitation method. The structure and morphology of the nanocrystal samples were characterized by using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM), respectively. The emission spectra and excitation spectra of samples were measured. J-O parameters and quantum efficiencies of Eu3+ 5D0 energy level were calculated, and the concentration quenching of Eu3+ luminescence in different matrixes were studied. The results indicated that effective Eu3+:5D0-7F2 red luminescence could be achieved while excited by 395 nm near-UV light and 465 nm blue light in Gd2WO6 host, which was similar to the familiar Gd2(WO4)3:Eu. Therefore, the Gd2WO6:Eu red phosphors might have a potential application for white LED.     

Er^3＋掺杂玻璃的1．5μm发射光谱及其带宽

用高温熔融法制备了Er^3 掺杂的氧化物玻璃，研究了Er^3 在11～300K温度范围内对应于^4I13/2→^4I15/2跃迁的1．5μm发射光谱，将^4I13/2多重态中的高能态和最低能态向基态跃迁发射的光谱成分从测量的发射光谱中分离开来，讨论了光谱成分对1．5μm发射带宽的影响。提出了等效四能级模型，并用此模型解释了Er^3 ^4I13/2→^4I15/2辐射跃迁的线形及其变温特性。分析表明，提高^4I13/2多重态中高能态的辐射跃迁几率是获得室温下宽带1．5μm发射的关键。最后，根据Mc Cumber理论，利用吸收光谱变换得到了与测量一致的发射光谱形状及相应的受激发射截面。     

新型掺铒碲酸盐玻璃光谱性质和热稳定性研究

采用高温熔融法制备了掺Er^3＋：TeO2-B2O3-SiO2-Na2O系列玻璃样品。对样品吸收光谱、发射光谱、差热曲线和Er^3＋：4I 13／2能级的荧光寿命进行了测试和分析。计算得到Er^3＋的J-O强度参数Ωλ（λ=2,4,6）,讨论了SiO2的含量对Er^3＋在该系列玻璃样品中发光性能的影响。结果表明,SiO2的引入有效提高了玻璃材料的有效发射带宽和热稳定性,有效抑制了材料的荧光上转换效应。同时,计算得到Er^3＋：^4 I13／2→^4I 15/2能级的量子效率为ηmax=63％。     

Luminescent properties of Eu~(3+) doped Gd_2WO_6 and Gd_2(WO_4)_3 nanophosphors prepared via co-precipitation method

Eu3+ doped Gd2WO6 and Gd2(WO4)3 nanophosphors with different concentrations were prepared via a co-precipitation method. The structure and morphology of the nanocrystal samples were characterized by using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM), respectively. The emission spectra and excitation spectra of samples were measured. J-O parameters and quantum efficiencies of Eu3+ 5D0 energy level were calculated, and the concentration quenching of Eu3+ luminescence in dif...     

Preparation and Optical Properties of Er^3＋-Doped Gadolinium Borosilicate Glasses

Er3 -doped Gd2 O3 -SiO2 -B2 O3 -Na2O glasses were prepared, and formation range of glass of Gd2 O3 -SiO2 -B2O3 system was experimentally obtained. It is found that the glass phase can be formed only when the content of SiO2 is 0～50%(molar fraction), Gd2O3 is 0～30%(molar fraction) and B2 O3 is above 20%(molar fraction) in this glass system. The glass can also be obtained but becomes translucent at the contents of 60%(molar fraction) SiO2 and 30% Gd2O3 , or at the contents of 60%(molar fraction) SiO2 and 30%(molar fraction) B2O3. There is no glass phase formed in other glass components. Glass forming ability for Gd2O3 content of 10%, was characterized by the value of β, the parameter of crystallization tendency, which is 0.32～1.76, obtained from the differential thermal analysis. The absorption and emission cross section, the J-O parameters Ωt(2,4,6) and radiative transition probabilities were calculated by using the theory of McCumber and Judd-Ofelt. The emission properties at 1.5 μm of the samples are discussed with the product of full width at half maximum and stimulated emission cross section. It can be seen that the value of the FWHM×σepeak product in the prepared glass is more than those of germanate, silicate and phosphate glasses. Furthermore, the maximum value of the product among these glasses reported in this work is close to that of oxyfluoride silicate glass. Therefore, the Er3 -doped gadolinium borosilicate glass in this paper is a candidate for broadband erbium doped fiber amplifiers.     

新型掺铒镥硼硅酸盐玻璃的制备和红外发光性质研究

用高温熔融法制备了成分为:Er2O3,Lu2O3,SiO2,B2O3和Na2O的新型玻璃体系,探索了该玻璃体系的成玻范围,发现该玻璃体系在(摩尔分数)SiO2:0～50%,Lu2O3:0～25%和B2O3:20%以上的范围内均可形成完全透明的玻璃,在Lu2O3:10%.SiO2:50%,B2O3:30%和B2O3:30%,SiO2:60%两个组分附近时玻璃轻微失透.除此以外,在其他组分实验上没有得到玻璃.利用McCumtber理论计算出了样品的吸收和受激发射截面,并从玻璃1.5 μm的吸收光谱出发拟合出了Judd-Ofelt参数Ωλ(2,4,6).结果表明,该玻璃体系具有较大的吸收和受激发射截面.差热分析的数据表明,该玻璃体系具有极好的热稳定性.因此,从1.5μm发射的增益带宽和热稳定性两个方面来考虑,本文所制备的镥硼硅酸盐玻璃体系是一种具有应用潜力的掺铒光纤放大器的基质材料.