Preparation of Bismuth Oxide Photocatalyst and Its Application in White-light LEDs. (27th October 2013)

• Record Type: Journal Article
• Authors: Chu, Yen-Chang; Lee, Gang-Juan; Chen, Chin-Yi; Ma, Shih-Hsin; Wu, Jerry J.; Horng, Tzyy-Leng; Chen, Kun-Huang; Chen, Jing-Heng
• Other Names: Yu Jiaguo Academic Editor.
• Is Part Of: Journal of nanomaterials. Volume 2013(2013)
• Publication Date: 2013-10-27
• Subjects: Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Nanomatériaux; Nanostructured materials; Nanotechnology; Nanostructures; Nanotechnology; Periodicals; Fulltext; Internet Resources; Periodicals; 620.115
• DOI: 10.1155/2013/596324
• Languages: English
• ISSNs: 1687-4110

Abstract

Abstract : Bismuth oxide photocatalysts were synthesized and coated on the front surface of phosphor-converted white light-emitting diodes to produce a safe and environmentally benign lighting source. Bismuth oxide photocatalyst powders were synthesized with a spray pyrolysis method at 500°C, 600°C, 700°C, and 800°C. Using the absorption spectrum in the blue and UV regions of the bismuth oxide photocatalysts, the blue light and UV leakage problems of phosphor-converted white LEDs can be significantly reduced. The experimental results showed that bismuth oxide photocatalyst synthesized at 700°C exhibited the most superior spectrum inhibiting ability. The suppressed ratio reached 52.33% in the blue and UV regions from 360 to 420 nm. Related colorimetric parameters and the photocatalyst decomposition ability of fabricated white-light LEDs were tested. The CIE chromaticity coordinates ( x, y ) were (0.349, 0.393), and the correlated color temperature was 4991 K. In addition, the coating layer of photocatalyst can act as an air purifier and diffuser to reduce glare. A value of 66.2 ± 0.60 ppmv of molecular formaldehyde gas can be decomposed in 120 mins.