摘要
本文使用多次漫反射法测得粉末LaOCl:Eu的漫反射吸收谱,结合所测的LaOCl:Eu的激发光谱,直接得出~5D_1能级的无辐射量子效率,再由所测~5D_1能级寿命得出它的无辐射跃迁几率。另一方面,使用Ω参数法,即利用Ω参数计算~5D_1的辐射跃迁几率,然后由所测寿命值计算出无辐射跃迁几率,来验证第一种方法所得结果。两者结果接近,表明前一种方法是简便可行的。
T o methods have been used to determine the non-radiative transition probability of 5D1 state of Eu3 + .(1)Partlo 's method.The quantum efficiency from state A to state B(Fig.4) can be obtained from the absorption spectrum and the excitation spectrum according to formula( 1 ), where PA and PB are the power absorbed by A and B respec-tivel,QAL and QBL are the emission intensities of L generated by excitation to A state and B state respectivel ,and VA and VB are respectively the energies(in wave-number) of A and B. The absorption spectrum of the phosphor can be determined from the diffuse reflection spectrum according to our previous work. The quantum efficienc from 5D1 to 5D0 is then determined to be 79.6%. The non-radiative transition probability of 5D1 is 5.64×10-3/sec.(2)Judd-Ofelt's method. In calculating the intensity parameters j(j=2,4, 6) from the emission spectrum according to J-O theory the index of refraction n of LaOCl(which is unkno n) is evaluated by the method we proposed in a recent paper.The nonradiative transition probability of 5D1, which can be obtained from the radiative transition probability of 5D1 to 7Fj (for all j values) and the measuied lifetime, is 5.28×10~3/sec,which agree fairly well with the fromer value.It appears that the first method is more convenient and probably more accurate.
出处
《发光学报》
EI
CAS
CSCD
北大核心
1990年第3期161-166,共6页
Chinese Journal of Luminescence
基金
国家自然科学基金
