Nd3+-Doped Silicate Glasses as an Efficient Color Filter to Improve the Color Gamut of a White LED

作者：Han Karam; Kim Yong Hwan; Chung Gi Won; Shin Chun Hwa; Hwang Hun; Chung Woon Jin^*

来源：Journal of the American Ceramic Society, 2018, 101(1): 40-44.

DOI：10.1111/jace.15228

• glass
• optical materials
• photoluminescence
• rare earths
• silicates

Nd3+-doped silicate glass (Nd-glass) was employed as a color filter for a white LED based on red and green phosphor (RG-LED), to manipulate the photoluminescence spectral shape and thus to provide a wider color gamut. The hypersensitive transition of Nd3+:(4)I(9/2)(4)G(5/2),(2)G(7/2) was adjusted via glass composition and Nd concentration, and improved absorbance as well as reduced the absorption bandwidth. The effective absorption of the Nd-glass at similar to 580nm reduced the spectral linewidth of the green and red emissions, improving the color reproduction range. The color gamut of the RG-LED was improved from 75.3% to 81.6% NTSC by the introduction of Nd-glass as a color filter. Reliability under high operating current and high temperature were also examined and discussed.

• 出版日期2018-1