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Thermal quenching Analysis of In2(MoO4)3:Eu3

Last Update Time: 2018-10-11 10:22:24
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Thermal quenching Analysis of In2(MoO4)3:Eu3

In order to study the thermal stability of Ino: EU phosphors,the thermal quenching tests were carried out for the sample In2(MoO4)3:Eu3.the chromaticity coordinates and relative brightness of phosphors measured at different temperatures (34.1 ~ 129C, temperature interval: 10C).

Value.It can be seen from the table that the optical properties of the phosphors prepared in terms of chromaticity coordinates and relative brightness are almost unaffected by temperature rise. The results show that the high temperature luminescence properties of phosphors and the heat emitted by In2 chips have little effect on the phosphors.

With the increase of temperature, the luminescence intensity of phosphors began to rise and then decreased.Compared with the initial temperature of 34.1 C,the luminescence intensity of the phosphor decreases by 11.6% at the highest temperature of 129C.The phenomenon that the luminescence intensity of phosphors decreases rapidly when the luminescence intensity exceeds a certain temperature is called temperature quenching. In the phosphor powder,the luminescence intensity of the phosphor decreases sharply when the temperature exceeds 70C,which indicates that the ideal operating temperature of the phosphor is lower than this temperature.

The temperature quenching of luminescence intensity of phosphor powder can be used

When the temperature of the configuration coordinate model is increased,the energy of character vibration of fluorescent lattice increases,the probability of ion transition decreases and the absorption intensity weakens.In the process of emission,the electric F in the excited state releases the acoustic F image to the low level state,and the luminescence intensity decreases.The electron energy level E of the ground state and the electron energy level of the excited state E are intersected at T. When the activator ion EU is excited from point A (ground state) to point B (excited state), if the temperature of the phosphor is higher, the vibrational energy increases, The system obtains an activation energy AE, which makes the energy of the system rise to T point, and T point is a point in the ground state curve, so that the electron will follow T. →+ D + A direction nonradiative ground relaxation to ground state and then lattice relaxation to base The equilibrium point of the state leads to the temperature quenching of luminescence. With the increase of ar in the configuration diagram, the shorter the distance from C to T point is, the smaller the AE will be and the temperature quenching will occur at lower temperature. In the phosphors of the system, the luminescence intensity increases with the temperature at the beginning of the system, which may be due to the fact that the AE of the system is almost unaffected by the temperature at lower temperature.