| 简介 |
The invention relates to a light emitting de-vice (1) with high colour rendering comprising a wave-length converting member (2) with a luminescent medium for wavelength conversion of blue light and/or ultraviolet light (10) into red light and/or yellow and/or green light and a light source (3) emitting blue light (10) and/or ultra-violet light arranged to pump the luminescent medium, said luminescent medium essentially having a main phase of a solid state host material which is doped withCe3+ --ions. According to the invention the host material com-prises ions of a further rare-earth material Ln, wherein the host material is selected such that the emission energy of the 5d-4f emission on Ce3+ -ions is energetically higher than the absorption energy into an upper 4fn state of the further rare-earth material Ln, and wherein the light emis-sion of wavelength converted light is caused by an intra--atomic 4fn- 4fn transition within the ions of the further rare-earth material. The invention further relates to a cor-responding lighting system comprising the light-emitting device and a corresponding luminescent medium. |
客服热线：
手机版
二维码
