2015
DOI: 10.3788/col201513.071601
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Luminescence of Tb3+/Eu3+ codoped LiYF4 single crystals under UV excitation for white-light LEDs

Abstract: The absorption spectra, excitation spectra, and emission spectra of Tb 3þ ∕Eu 3þ ions in LiYF 4 single crystals synthesized by an improved Bridgman method are measured. The emission spectra of several bands, mainly located at blue ∼487 nm (Tb: 5 D 4 → 7 F 6 ), yellowish green ∼542 nm (Tb: 5 D 4 → 7 F 5 ), and red ∼611 nm (Eu: 5 D 0 → 7 F 2 ) wavelengths, are observed under excitation by UV light. An ideal white light emission as a result of simultaneous combination of these emissions can be obtained from 1.11 … Show more

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Cited by 9 publications
(4 citation statements)
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“…To advance further with pc-LEDs in lighting industry, researchers have proposed methods adding phosphor material that can compensate for the lack of chromatic light and improve color rendering abilities of pc-LEDs [5]- [8]. However, the spectral emission range of red phosphor is not suitable for white light LEDs and negatively affects the LE [8], [9]. Recently, semiconductor quantum dots (QDs) in SSL applications have attracted numerous researches with their potential to enhance pc-LEDs with strait spectral emission, adjustable bandgap and elevated light [10]- [13].…”
Section: Introductionmentioning
confidence: 99%
“…To advance further with pc-LEDs in lighting industry, researchers have proposed methods adding phosphor material that can compensate for the lack of chromatic light and improve color rendering abilities of pc-LEDs [5]- [8]. However, the spectral emission range of red phosphor is not suitable for white light LEDs and negatively affects the LE [8], [9]. Recently, semiconductor quantum dots (QDs) in SSL applications have attracted numerous researches with their potential to enhance pc-LEDs with strait spectral emission, adjustable bandgap and elevated light [10]- [13].…”
Section: Introductionmentioning
confidence: 99%
“…With outstanding performance and remarkable features that improve the lighting efficiency, durability, power-saving as well as the low waste-emission rate, the Light-emitting diodes (LEDs) has grown passed many traditional lighting methods and become one of the most reliable light source for modern solid-state lighting [1][2][3][4]. However, to keep the development going, there must be improvements in the way that the white light in these LEDs is produced, which is integrating the blue light from a chip and yellow light from yellowish phosphor, known as YAG:Ce [5,6]. Although this method is cost-effective regard of is lumen output, the chromatic quality is rather poor and often results in unwanted effect called "the yellow ring" that damaged the color output [7][8][9].…”
Section: Introductionmentioning
confidence: 99%
“…However, tetragonal-phase LiYF 4 crystals exceed the optical properties of NaYF 4 because they promote stronger upconversion emissions and generate UV emission lines [27]. The crystalline phases of several LiYF 4 samples have been synthetized by thermal decomposition, sol-gel, and Bridgman methods [28,29,30]. However, with these approaches it is impossible to sinter a phosphor plate.…”
Section: Introductionmentioning
confidence: 99%