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CaYAl3O7: Eu3+ phosphor sample is synthesized through solid state method. The structural property of synthesized material is analyzed by using XRD patterns. The AFM image analysis shows the topography of samples with formation of nano-structure and spherical shape. The optical property of a sample is monitored by using 260 nm excitation sources. The dominant peak of red hue is found at 620 nm due...
In the present communication, d.c. conductivity of a-Se 80 Te 20 and a-Se 80 Te 10 M 10 (M = Cd, In, Sb) alloys has been studied in the temperature range 225–311 K in order to identify the conduction mechanism and to analyze the effect of different metallic additives on d.c. conduction in a-Se 80 Te 20 alloy below the room temperature. An analysis...
The present paper reports on thermally stimulated current measurements in a-Se 99.5 Bi 0.5 thin films at different heating rates (β 1 = 2.17 K/min, β 2 = 2.85 K/min, β 3 = 5.00 K/min). A well-defined TSC peak at a particular temperature has been observed which shifts toward higher temperatures (T 1 = 362 K, T 2 = 372 K, T 3 = 392 K)...
Temperature and frequency dependence of a.c. conductivity have been studied in glassy Se 70 Te 30−x Sb x (4 ≤ x ≤ 10) alloys. The observation of Further Meyer–Neldel rule in case of a.c. conductivity is reported. The observation of the correlation between Meyer–Neldel pre-factor σ 00 and Meyer–Neldel energy is explained by multiple excitations stimulated by optical...
In the present paper, we report the observation of the Meyer–Neldel rule (MNR) in thermally activated high field conduction in bulk samples of glassy Se 100−x Sb x alloys. We have investigated Meyer–Neldel rule by two different approaches.In first approach, the temperature dependence of d.c. conductivity is studied at different electric fields without changing the composition of the...
The present paper reports the d.c. conductivity measurements at high electric fields in vacuum-evaporated thin films of amorphous Se 80 Te 20 , Se 75 Te 20 Ge 5 and Se 75 Te 20 Sb 5 systems. Current-voltage (I-V) characteristics have been measured at various fixed temperatures. In all the samples, at low...
Temperature dependence of conductivity is studied in dark as well as in presence of light in amorphous thin films of Se 90 Ge 10-x In x (x=0, 2, 4, 6, 8 and 10) prepared by vacuum evaporation technique. The dark conductivity increases exponentially with temperature, between 293 and 373K, indicating that the conductivity is a thermally activated process....
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