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Nd 3+ ‐Doped Silicate Glasses as an Efficient Color Filter to Improve the Color Gamut of a White LED
Author(s) -
Han Karam,
Kim Yong Hwan,
Chung Gi Won,
Shin Chun Hwa,
Hwang Hun,
Chung Woon Jin
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15228
Subject(s) - gamut , materials science , optics , ntsc , red color , brightness , color temperature , phosphor , photoluminescence , color gel , color filter array , doping , absorption (acoustics) , color rendering index , optoelectronics , telecommunications , physics , computer science , composite material , high definition television , layer (electronics) , thin film transistor
Nd 3+ ‐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 Nd 3+ : 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 ~580 nm 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.