Improvement of lumen efficiency in white light-emitting diodes by roughened-dispensing package

White light-emitting diodes (LEDs) with roughened-dispensing package through a simple imprinting technique are demonstrated and fabricated. The imprinting mold was fabricated by naturally wet-etched (100) Si substrate, which did not require expensive lens mold and pattern definition. The lumen output of roughened-dispensing package was enhanced by 5.4 % and 2.5 %, at driving current of 120 mA, compared to reference flat phosphor-dispensing package without and with lens molding, respectively.