International Year of Light and Light-Based Technologies

Oelgemöller, Michael; Vamvounis, George

doi:10.1071/ch15623

Cited by 2 publications

(1 citation statement)

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“…Light is an indispensable part in the modern life, bringing brightness and hope to human beings. − In order to commemorate the first study of the Arab scholar Ibn Khasham for one thousand years and the great discoveries in the field of light over the past thousand years, 2015 is designated to be the International Year of Light and Light-Based Technologies (abbreviated as IYL 2015). , However, nearly 20% of the global electricity has been consumed for lighting, and with the proposal and development of sustainable technology, , the ever-growing demand for green, sustainable, and equally performing lighting has spurred enormous interest in the exploration of novel lighting devices. Nowadays, the energy-saving white light-emitting diode (LED) devices are in tremendous demand and undoubtedly become the next-generation solid-state lighting device attributed to their unique advantages such as environmental protection, compact size, durability, and long operational lifetime. − White LEDs have been widely utilized for lighting, replacing conventional incandescent and fluorescent lamps.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Broad-Band Green-Emitting Cerium(III)-Activated Garnet Phosphor Allows the Fabrication of Blue-Chip-Based Warm-White LED Device with a Superior Color Rendering Index

Chan

Cao

et al. 2022

Inorg. Chem.

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High-performance warm-white light-emitting diode (LED) devices are in great demand toward green and comfortable solid-state lighting. Herein, we report a creative green-emission CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ phosphor. CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ compounds with different cerium ion doping contents have been successfully prepared through a conventional high-temperature solid-state method, and their phase and crystal structure have been revealed via the powder X-ray diffraction and Rietveld refinement. Impressively, the CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ phosphors exhibit a broad-band excitation, which well covers the wavelength region from the 300 to 500 nm, corresponding to the commercial blueemitting LED chip. Upon 450 nm excitation, the optimal CaY 2 HfGa(AlO 4 ) 3 :2%Ce 3+ sample shows an intense broad-band green emission (the corresponding testing spectral range: 460− 750 nm) with a strongest peak about 534 nm. In addition, the CaY 2 HfGa(AlO 4 ) 3 :2%Ce 3+ sample possesses a broad full width at halfmaximum equal to 120 nm; moreover, its CIE chromaticity coordinate and the internal quantum efficiency are determined to be (0.3541, 0.5427) and 72.8%, respectively. A high-quality warm-white LED has been fabricated through incorporating our CaY 2 HfGa(AlO 4 ) 3 :2%Ce 3+ green phosphors and commercial red phosphors with the 450 nm blue LED chip. When upon the 20 mA bias driving current, the LED device demonstrates a bright warm-white light emission, which possesses a satisfactory color rendering index of 91, a low correlated color temperature of 4080 K, as well as a good luminous efficacy of 85.14 lm W −1 . The creative greenemitting CaY 2 HfGa(AlO 4 ) 3 :Ce 3+ garnet phosphor has a bright application prospect toward high-quality warm-white LED lighting.

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