| 摘要 |
<p>A blue phosphor having solved such problems of conventional blue phosphors that blue luminance rapidly decreases with aging and that the blue chromaticity point y-value is increased with the result that, when white display is effected by lighting red, green and blue cells, the color temperature is decreased. In particular, a blue phosphor comprising a matrix material of any of yttrium borate, gadolinium borate and yttrium borate/gadolinium borate compound and comprising an emission center of thulium.</p> |
