The stability of phosphors suspend in an aqueous solution
Date Issued
2006
Date
2006
Author(s)
Siao, Huei-Wun
DOI
zh-TW
Abstract
The performance of the spray of phosphor slurry on glass substrate depends largely upon both its particle size distribution and stability. In this study, ball milling is adopted to reduce the mean particle size of phosphor particles, and polyethylene glycol (PEG） is introduced into a phosphor slurry to improve its stability. The experimental data gathered reveal that the mean particle size of mixed phosphor decreases about 2.6μm after milling, but the reduction in the mean size of red phosphor is less than 0.5μm. For a fixed total mass of milling balls, the larger the ratio (amount of small milling balls/amount of large milling balls) the smaller the mean particle size after milling. The minimum mean particle size and the maximum amount of PEG adsorption occur at 1.6 wt% of PEG. We show that for red phosphor and blue phosphor slurries, although its stability increases with the increase in the PEG dosage, the degree of improvement, however, is limited. For green phosphor slurry, its stability increases considerably when the dosage of PEG is lower than about 0.8 wt%. If the PEG dosage exceeds about 1.6 wt%, due to polymer bridging, the stability declines. In this case, coagulation between particles occurs, and fast precipitation is observed.
Subjects
螢光體
懸浮
穩定性
水溶液
phosphor
suspend
stability
aqueous solution
Type
thesis
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