Cyan phosphors for full-visible-spectrum lighting: shining new light on high-CRI white pc-LEDs

A broadband cyan-emitting Ca2LuZr2(AlO4)3:Ce3+ garnet phosphor for near-ultraviolet-pumped warm-white light-emitting diodes with an improved color rendering index

“…The near-UV-pumped white LEDs based on tricolor phosphors suffer from one limitation that in their emission spectra there is a cyan gap in the 480-520 nm wavelength region, which reduces the CRI value and decreases the color vividness. [23][24][25][26] The cyan-emitting phosphors can fill the cyan gap in the 480-520 nm wavelength range, and thus exploring a suitable cyan phosphor is very important to realize high-CRI warmwhite LEDs excited by near-UV light.…”

Full-Spectrum White Light-Emitting Diodes Enabled by an Efficient Broadband Green-Emitting CaY2ZrScAl3O12:Ce3+ Garnet Phosphor

“…39,40 CRI values of blue-excited white LEDs are usually limited by the cyan gap between the blue light emitted by an InGaN-LED chip and the emission of common green-yellow phosphors (e.g., YAG:Ce 3+ and LuAG:Ce 3+ ). 8,41 Overcoming this limitation requires an efficient broadband green phosphor that emits in this particular cyan spectral region and possesses strong absorption in the blue spectral range. As shown in Figure 3b, CaY 2 ZrScAl 3 O 12 :1%Ce 3+ emits across the 480−520 nm bluish-green cyan spectral region (the pink-colored shadow), rendering it a promising material to close the cyan gap in high-CRI phosphor-converted white LEDs.…”

“…Film/video and medical lighting applications also require consideration of R9 and R12, which emphasize saturated red and saturated blue, respectively. 8 Full-visible-spectrum lighting has garnered recent attention and is characterized by an emission spectrum similar to the solar spectrum with each wavelength segment of color light in the visible-light region. Such full-visible-spectrum lighting can relieve visual fatigue, thereby reducing discomfort for viewers, 9 and offers the same physiological and psychological benefits as sunlight.…”

A tunable blue–cyan dual emission phosphor in Ca4−xLu2xHf1−xGe3O12:Bi3+ via forming segregation structure for WLEDs

“…In the current world, energy and environmental problems are increasingly serious, energy conservation, and emission reduction are imperative. 1,2 As an indispensable part of daily life and industrial production, human energy consumption in lighting has reached more than 20% of the total energy consumption. 3,4 In recent years, phosphor-converted white light-emitting diodes (WLEDs), a new generation of solid-state light source based on the combination of phosphor and light-emitting diode, have developed rapidly because their prominent strengths outweigh the traditional light sources, such as energy saving, longer lifetimes, high efficiency, and environmental friendliness.…”

“…In the current world, energy and environmental problems are increasingly serious, energy conservation, and emission reduction are imperative 1,2 . As an indispensable part of daily life and industrial production, human energy consumption in lighting has reached more than 20% of the total energy consumption 3,4 .…”