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The dependences of light efficiency of radiation(LER) and color-rendering index(CRI) of trichromatic white light-emitting diode(wLED), composed of blue LED die, green/yellow, and red phosphors, on the peak wavelength of each primary were investigated by theoretical calculations, at correlative color temperature(CCT) from 2,700 to 6,500 K. The peak wavelength of InGaN based blue LED chip ranges from 450 to 471 nm, while those of Ca3 Sc2 Si3 O12 :Ce3?, b-SiAlON:Eu2?, and Y3 Al5 O12 :Ce3? based green/yellow phosphors range from 511 to 572 nm, and those of Sr2 Si5 N8 :Eu2?and CaAlSiN3 :Eu2?red phosphors range from 620 to 650 nm, which cover almost all the practically used, commercially available wave bands until now. Then, based on the results, selection guides of peak wavelengths for blue LED chip and phosphors to obtain tradeoff LER [280 lm W-1as well as CRI [80 in all CCTs are proposed. The favorable wave bands of each primary are suggested.
The dependences of light efficiency of radiation (LER) and color-rendering index (CRI) of trichromatic white light-emitting diode (wLED), composed of blue LED die, green / yellow, and red phosphors, on the peak wavelength of each primary were investigated by theoretical calculations, at correlative color temperature (CCT) from 2,700 to 6,500 K. The peak wavelength of InGaN based blue LED chip ranges from 450 to 471 nm, while those of Ca3Sc2Si3O12: Ce3 ?, b-SiAlON: Eu2 ™ and Y3 Al5 O12: Ce3-based green / yellow phosphors range from 511 to 572 nm, and those of Sr2 Si5 N8: Eu2 ™ and CaAlSiN3: Eu2 ™ red phosphors range from 620 to 650 nm, which cover almost all the practically used, commercially available wave bands until now. Based on the results, selection guides of peak wavelengths for blue LED chips and phosphors to obtain tradeoff LER [280 lm W-1 as well as CRI [80 in all CCTs are proposed. favorable wave bands of each primary are suggested.