Abstract
Influence of microstructure of YAG:Ce powder particles on their optical properties is studied to estimate light extraction efficiency from them. YAG:Ce powders are obtained using co-precipitation method and subsequent heat treatment. Single-phase garnet powder is obtained after heating to 1000 °C and higher. Microstructure changes significantly with increase of heat treatment temperature: after heat treatment at 900 °C powder comprises pieces of xerogel consisting of 20 nm particles and transparent in transmitted light under the optical microscope; after a heat treatment at 1300 °C well defined grains and pores are formed in powder particles, which is accompanied by a significant decrease of optical transparency. Photoluminescence intensity increases most significantly up to heat treatment temperature of 1300 °C, further increase of temperature leads to increase of photoluminescence intensity by less than 10%. It is supposed that development of pores in the particles obtained after thermal treatment above 1300 °C diminishes light extraction.
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