Molded photoluminescent materials materials that resist degradation and deliver long, high afterglow are needed for use in commercial products. Ichikawa, Yamamoto, et al. used a light meter to select optimal molding conditions,and succeeded in finding highly robust molding conditions that reduced the necessary amount of photoluminescent material and thereby the cost. Their light meter, however, had a narrow measurement range, making it difficult to evaluate the uniformity of the afterglow over the entire surface of the luminescent body. The goal of the present study was one-step measurement of the entire luminescent body. In a first experiment, a digital video camera was used to evaluate a local part of the luminescent body. Since parameter design was in its third phase, high measurement precision was required. Conditions that improved the precision were found by focusing on the temperature characteristics of the digital video camera and the initial state of the luminescent body. These conditions were then applied in an L18 experiment that succeeded in obtaining a reproducible gain and identifying a superior set of molding conditions. Repetition of the measurement under identical conditions showed the measurement of the luminescent body to be very precise.
