| http://www.w3.org/ns/prov#value | - The longer the t1 is or the larger the ratio of t2/t1 is, the higher such characteristics become. t1 of the phosphor to be used in the light-emitting device of the present invention is usually at least 155 ns, preferably at least 160 ns, more preferably at least 170 ns, furthermore preferably at least 190 ns, and the upper limit is not particularly limited, but is preferably at most 10 ms because
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