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Optimal phosphors for fluorescent lamps Disclosure Number: IPCOM000020739D
Publication Date: 2003-Dec-11
Document File: 1 page(s) / 93K

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Optimal phosphors for fluorescent lamps

In fluorescent-low pressure-mercury dosed-lamps, the triband phosphors are used for good lumen and colour rendering performance. These triband components can be recognized in the supplier brochures by their element abbreviations. This triband family refers to BAM and BAMG for the blue phosphor, LAP,CBT, or CAT for the green phosphor, and YOX for the red phosphor. Suppliers have different types of these components in terms of rare earth element dopant level and average particle size. The appropriate type depends on lamp type. One can discriminate in lamp types by considering amount of energy per surface area of the lamp and triband mix composition.

    This particle size and dopant level can be tailored in phosphor manufacturing by means of defining the appropriate raw material or by adjusting the synthesis conditions (e.g. amount and type of flux during firing and firing time and temperature).

    For fluorescent-low pressure-mercury dosed-lamps, average phosphor particle size (with respect to volume) in the range of300nm to 15 㯰m are of interest. By using the best powder synthesis conditions one can have distinctive advantages in the product performance considering lumen level per amount of phosphor, lumen degradation in time, volatile mercury loss in time. By means of testing this particle size range of triband phosphors in any fluorescent-low pressure-mercury dosed-lamp, one can appreciate these differences.

    For exam...