| 摘要 |
When a peak wavelength of light emerging from a light-emitting layer is lambdap(k) (k=1, 2, . . . , m in an order from a smallest wavelength), the peak wavelength lambdap(k) is less than a value ne(k)P(k) that is obtained by multiplying an extraordinary-ray refractive index ne(k) of a selective reflection layer that forms each selective reflection region by a helical pitch P(k), and is greater than a value no(k)P(k) that is obtained by multiplying an ordinary-ray refractive index no(k) by the helical pitch P(k). A relationship, ne(k-1)P(k-1)<no(k)P(k), is established between the selective reflection layers that form the selective reflection regions.
|
