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Fig. 4. (Color online) Emitting spectra of YAG-Top type white LEDs(a-b) and QD-Top type white LEDs(c-d). The numbers in mm denote the thickness of YAG phosphor plates adopted in each structure. Refractive indices of the photopolymers or air gap are shown in the inset of each sub-figure.
New Phys.: Sae Mulli 2022;72:621~627