Development of mercury-free ultraviolet light emitting devices

Kita, Takashi

doi:10.1109/ivnc.2018.8520065

Cited by 2 publications

(1 citation statement)

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“…Rare‐earth‐doped inorganic phosphors have been an area of research for promising technologies such as light‐emitting diodes (LEDs), solid‐state lighting (SSL), scintillators, solar cells, infrared quantum counter detectors, plasma display panels, and field emission displays . SSL devices based on LEDs currently are promising next generation light sources . LEDs have a 10 times greater lifespan that ordinary lighting systems such as incandescent lamps and compact fluorescent lamps (CFLs).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and luminescence study of Eu³⁺‐doped SrYAl₃O₇ phosphor

Kadam

Dhoble

2019

Luminescence

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Rare-earth ions play an important role in eco-friendly solid-state lighting for the lighting industry. In the present study we were interested in Eu 3+ ion-doped inorganic phosphors for near ultraviolet (UV) excited light-emitting diode (LED) applications.Eu 3+ ion-activated SrYAl 3 O 7 phosphors were prepared using a solution combustion route at 550°C. Photoluminescence characterization of SrYAl 3 O 7 :Eu 3+ phosphors showed a 612 nm emission peak in the red region of the spectrum due to the 5 D 0 → 7 F 2 transition of Eu 3+ ions under excitation at 395 nm in the near-UV region and at the 466 nm blue excitation wavelength. These red and blue emissions are supported for white light generation for LED lighting. Structure, bonding between each element of the sample and morphology of the sample were analysed using X-ray diffraction (XRD) and scanning electron microscopy (SEM), which showed that the samples were crystallized in a well known structure. The phosphor was irradiated with a 60 Co-γ (gamma) source at a dose rate of 7.2 kGy/h. Thermoluminescence (TL) studies of these Eu 3+ -doped SrYAl 3 O 7 phosphors were performed using a Nucleonix TL 1009I TL reader. Trapping parameters of this phosphor such as activation energy (E), order of kinetics (b) and frequency factor (s) were calculated using Chen's peak shape method, the initial rise method and Ilich's method.

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Section: Introductionmentioning

confidence: 99%