Radiation pattern control by the sidewall angle of Bi2O3–B2O3 based glass phosphor doped with Yb3+ and Nd3+
The dependence of the radiation pattern on the sidewall angle of Bi2O3–B2O3 based glass phosphors doped with Yb3+ and Nd3+ has been investigated. Batwing-like radiation patterns were observed for sidewall angles of 0° and 15°. On the other hand, Lambertian-like radiation patterns were observed for sidewall angles of 30° and 45°. The highest near-infrared (NIR) light intensity was obtained for a sidewall angle of 30°. Calculated radiation patterns were close to experimental results. The calculated results reveal that the change of radiation patterns was due to the change of average path length of the NIR light in the glass phosphor. Therefore, it is concluded that, for practical uses, glass phosphor design should include the sidewall angle to obtain the appropriate radiation pattern.
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Document Type: Research Article
Publication date: February 1, 2013