"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

Sol-gel derived scheelite-type LiEuW2O8 red phosphor for white light emitting diodes

KYU-SEOG HWANG1,* , SEUNG-HWANGBO2, JIN-TAE KIM3

Affiliation

  1. Department of Biomedical Engineering, Nambu University, 864-1 Wolgye-dong, Gwangsan-gu, Gwangju 506-824, Korea
  2. Major in Photonic Engineering, Division of Electronic & Photonic Engineering, Honam University, 59-1 Seobong-dong, Gwangsan-gu, Gwangju 506-714, Korea
  3. Department of Photonic Engineering, College of Engineering, Chosun University, 375 Seosuk-dong, Dong-gu, Gwangju 501-759, Korea

Abstract

LiEuW2O8 phosphors with the optical function of color conversion from near-UV to red were prepared by sol-gel method using a lithium acetate dehydrate, europium(III) nitrate pentahydrate, and tungsten(VI) chloride as a starting materials. Viscous mixing sol was pyrolyzed at 200, 250 and 300°C for 120 min in air and then white powder precursor was finally annealed at 700°C for 240 min in Ar. Crystallinity, surface morphology, and photoluminescent properties are investigated by an X-ray diffraction analysis, field emission – scanning electron microscope and a fluorescent spectrophotometer. The characteristic emission of WO4-2 in LEW is quenched absolutely and only red-light emission of Eu3+ appears. Crystallinity, surface properties and red-emission by near-ultraviolet (395 nm) were improved by high-temperature pyrolysis..

Keywords

LiEuW2O8, Phosphors, Photoluminescent properties.

Submitted at: March 17, 2009
Accepted at: July 23, 2009

Citation

KYU-SEOG HWANG, SEUNG-HWANGBO, JIN-TAE KIM, Sol-gel derived scheelite-type LiEuW2O8 red phosphor for white light emitting diodes, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 7, pp. 1020-1024 (2009)