PURPOSE: To provide low power performance and high luminous efficiency by coating a resin composition having a 5 or more induction rate which is lower than that of an induction resin composition used for forming an illuminous layer at a recess on the upper part of the illuminous layer.
CONSTITUTION: A resin composition 7 is formed such that its induction ratio is lower than that of a high induction resin composition used for forming an illuminous layer on a recess on the top face of an phosphor 3 and is less than 5. The induction rate difference between the composition for coating the recess and the resin composition to be used for the layer 3 is varied according to the state of the recess, namely the thickenesses and of the resin composition for coating the recess and the layer 3 the like, however, normally it may be about 1 or more, and preferably about 2 or more. It is thus possible to realize low power performance and high illumination efficiency through the low current performance of element.
Yoshitake, Hiroshi
Tanahashi, Masayoshi
Next Patent: ILLUMINOUS DEVICE