Particle Size Effects and the Distribution of Barriers in Electroluminescent Zinc Sulfide Phosphors

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Abstract
The particle size of electroluminescent phosphors is found to be a significant factor in empirical equations describing brightness‐voltage relationships. These observations can be understood by considering the following factors: (a) number and distribution of barriers in a single particle, (b) division among the barriers of the voltage drop per particle, and (c) dependence on the particle size of the voltage drop per particle. Equations are derived which permit a comparison of the brightness of different phosphors.