Light emitting device having a straight-line shape

A light emitting device having a straight-line shape, comprising:

• a pair of first and second electrodes each having a straight-line shape which face each other;
• and
• a phosphor layer having a straight-line shape provided so as to be sandwiched between the pair of electrodes,
• wherein at least one of the pair of first and second electrodes is a transparent electrode,
• wherein the light emitting device having a straight-line shape further comprising at least one buffer layer provided so as to be sandwiched between the first or second electrode and the phosphor layer,
• wherein the buffer layer makes the height of a potential barrier between the electrode and the phosphor layer which sandwich the buffer layer lower than the height of a Schottky barrier when the electrode and the phosphor layer are brought into direct contact.