| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a luminous bulb with parallelism of light flux and recognition of light enhanced, and endowed with high luminance, high efficiency and persistence. <P>SOLUTION: Of the luminous bulb with a high-luminance LED and a luminous material emitting light by absorbing at least a part of its emission and converting it in wavelength, a main emission peak of the LED is 360 nm or less, the luminous material is a neutral luminous material activated by bivalent europium, and its emission wavelength is differed from that of the LED by 100 nm or more to realize a further light-emitting effect. An incident angle of light from an LED light-emission tip into a luminous material layer is to be 45° or less to secure the parallelism of irradiation light and prevent degradation of a light-emitting layer. <P>COPYRIGHT: (C)2008,JPO&INPIT |
