研究目的
To develop novel UV lighting sources that can replace currently available mercury lamps, focusing on the use of narrow band emissions from the intra-orbital electron transitions of rare earth ions, specifically gadolinium (Gd).
研究成果
The study successfully developed rare-earth doped phosphors for mercury-free narrowband ultraviolet light sources, achieving a narrowband luminescence line from Gd3+ ions at 318 nm. Field-emission devices using Al1-xGdxN thin films were fabricated, and bright fluorescent lamps with an ultraviolet phosphor containing Gd3+ ions were developed, offering a practical and sustainable solution to the challenge for launching the device.
研究不足
The external quantum efficiency becomes extremely small in the UVB (280-320 nm) and UVC (200-280 nm) wavelength regions. The spectral line width limited by the thermal carrier distribution near the band edge causes a relatively broad emission-band width being generally over 10 nm.
