ZnF2: Gd thin film electroluminescent device

ZnF2:Gd thin-film electroluminescent (EL) devices are known to emit intense ultraviolet (UV) light of a spectrum peaking at 311.5 nm, due to the 6P7/28S7/2 transition of Gd3+ ion. The UV emission is utilized as the excitation source for blue-emitting phosphors, realizing blue-emitting ELPL hybrid device. Through a systematic optimization of UV emitting EL device as well as the phosphor materials, a maximum luminance of 10 cd/m2 and a maximum efficiency of 0.015 lm/W have been achieved to the ELPL hybrid device. Full color emission devices using red, green and blue phosphors are also reported.