A review on the advancements in phosphor-converted light emitting diodes (pc-LEDs): Phosphor synthesis, device fabrication and characterization

Reliability study under thermal and photonic stresses of sulforhodamine B (SRB) confined in layered double hydroxide (LDH)

“…In lighting applications, white light-emitting diodes (WLED) are now emerging very strongly and constitute a reference in solid-state lighting sources because of their excellent properties, such as high light efficiency, energy-saving properties, long lifetime and absence of toxic mercury or other heavy metals. A commercial WLED consists of a blue chip, emitting between 450 and 480 nm, combined with a yellow-emitting phosphor (Nair et al, 2020), YAG:Ce 3+ (yttrium aluminium garnet doped with Ce 3+ cations), and a red-emitting phosphor is commonly added to improve the colorimetric characteristics of light (Xia et al, 2016). A recent study concerning a well-known organic dye, sulforhodamine B (SRB), underlined its interest as a red phosphor and its potential under commercial blue LED excitation when highly dispersed in a host structure, layered double hydroxide (LDH) (Legentil et al, 2020).…”

Temperature-Dependent Luminescence of Red-Emitting Ba2Y5B5O17: Eu3+ Phosphors with Efficiencies Close to Unity for Near-UV LEDs

“…During the past decade, phosphor-converted white light-emitting diodes (pc-WLEDs) were the research interest for many scientists and engineers because of their outstanding brightness and luminous efficiency, low power consumption, long device lifetime, reliability and eco-friendly characteristics compared to other lighting sources, for instance, incandescent and halogen light bulbs, and fluorescent lamps. To date, white LEDs are the most efficient lighting source [1][2][3]. There are several ways to produce white light by employing a blue or near-UV-emitting LED chip.…”

“…Mn 4+ -doped inorganic materials show efficient and sharp line red luminescence in the 600-750 nm spectral range. However, only phosphors based on fluoride host matrices (for instance, K 2 SiF 6 :Mn 4+ , BaTiF 6 :Mn 4+ ) possess suitable emission for white LEDs, i.e., below 650 nm [3,15,16].…”

“…However, there are also some problems relating these phosphors, such as colour shift at different temperatures and so on. Most of the white-light-emitting phosphors are based on energy transfer between Ce 3+ → Mn 2+ , Eu 2+ → Mn 2+ , Ce 3+ → Tb 3+ , Tb 3+ → Eu 3+ ion pairs or even more complicated systems [3,17].…”

Two‐Step Sol–Gel Synthetic Strategy for Highly Dispersed Eu2+ Luminescence Centers for Tuning Emission

“…However, with the accelerating development of the digital era, global electricity consumption increases yearly. [ 1 ] With this in mind, the technology of phosphors‐converted WLEDs (pc‐WLEDs), whose advantages feature low energy consumption, environmental friendliness, and long lifetime, has received more and more research attention with particular emphasis in the fields of the backlight display, indicators, general illumination, and architectural decoration. [ 2 ] For full‐spectrum illumination and full‐color display, a UV or blue LED chip combined with multiple phosphors is generally required to emit photons covering the entire visible spectrum (400–800 nm).…”