Abstract
Yellow phosphors play an important role in the fabrication of white light LEDs. In this study, we synthesized a series of yellow phosphors with Gd3BWO9 (GBWO) as the host material. The broad emission band in the range of 400 nm–620 nm is attributed to the 3P0→1S0 transition of Bi3+. The emission color is tuned from green to yellow by co-doping of Eu3+ or Sm3+ with Bi3+ in GBWO. Additionally, yellow phosphors excited by blue light (λex = 487 nm) were obtained by co-doping Tb3+ with Eu3+ or Sm3+ in GBWO host. The emission can be tuned from green to yellow and orange by adjusting the ratio of Tb3+/Eu3+ and Tb3+/Sm3+. The quantum yield of GBWO:0.25 Tb3+, 0.03Eu3+ yellow phosphor reaches 70.2%, and the quantum yield of GBWO:0.25 Tb3+, 0.05Eu3+ orange phosphor is as high as 83.7%. The present yellow phosphors that can be excited by both ultraviolet and blue light and having high quantum yields can be candidates for the application in white LED.
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