A light emitting device 1, wherein said predetermined distance is in {HEAD ~ the range} of {TAIL ~ 1 μm} to 10 mm 
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A light emitting device 1 , wherein said predetermined distance is in { HEAD ~ the range } of { TAIL ~ 1 μm } to 10 mm
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH