The Effect of Package Structure on the Light Extraction Efficiency of Near-Ultraviolet LED

Table 2

Comparison of two losses of different package structure interfaces.

Package structure	EECL (%)	The Fresnel loss			Total inner reflection loss
		Interface 1	Interface 2	Interface 3	Interface 1	Interface 2	Interface 3
Bare chip	55.09	L			L
Package 1	35.80	AL	H		AL	H
Package 2	49.09	L	H	H	L	N	N
Package 3	37.14	AL	AL	H	AL	AL	H
Package 4	52.44	L	H	AL	L	N	AL
Package 5	66.83	AL	AL	AL	AL	AL	AL