By Lyuji Ozawa

ISBN-10: 1420052705

ISBN-13: 9781420052701

This booklet comprises info got from genuine and extremely popular assets. Reprinted fabric is quoted with permission, and assets are indicated. a large choice of references are indexed. cause capable efforts were made to put up trustworthy facts and knowledge. however the writer and the writer can't think accountability for the validity of all fabrics or for the results in their use.

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Extra resources for Cathodoluminescence and Photoluminescence. Theories and Practical Applications

Sample text

12). 5 Optimal Particle Sizes for Practical Phosphors In designing CL phosphors, we have shown that crystal perfection of phosphor particles is not required for phosphor production. Thus, optimal particle size CPopl becomes an important concern in the production of phosphor powders. 2, that is, the C* that gives the maximum migration distance of EHs in phosphor particles. In the determination of C*, there are two difficulties associated with practical powdered phosphor screens: (1) the reproducibility of sample preparations, and (2) the measurement conditions of CD curves.

The CRT is well evacuated to 10-7 torr after the degassing process in pumping facilities. When the CRT seals off from the pumping facilities by melting down the exhausting glass tube, the vacuum pressure in the sealed CRT increases to 10-5 torr. The increase in pressure results from the trapped gases that are discharged from the melted glass tube, and is independent of the pumping facilities used. By slowly melting the glass tube, some of the discharged gases are removed from the CRT by pumping, and the amount of trapped gases significantly reduces to 10-6 torr.

14 Normalized CD curves of Y,02S:Eu phosphor. Curves of CL (pulse) and CL (dc) obtained under irradiation of pulsed (2 ns) and continuous (dc) electron beams (15 kV, 1,uA-cm-'). The CL curves inflect at Cpo and Cd'" respectively. Curve of PL (direct), which fits to curve by Equation (2_9), is obtained under 414---nm irradiation. studies of CD curves. The samples prepared with the established process are the same as for commercial phosphor powders, for which the particles are widely distributed in both size and shape.

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Cathodoluminescence and Photoluminescence. Theories and Practical Applications by Lyuji Ozawa


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