Narrow-band emitters in LED backlights for liquid-crystal displays

Composition Optimization of Multifunctional CsPb(Br/I)3 Perovskite Nanocrystals Glasses with High Photoluminescence Quantum Yield

“…Nowadays, great endeavors have been made to explore narrowband red-emitting materials with ultrahigh photoluminescence quantum yield (PLQY) and outstanding durability to optimize the properties of light-emitting diode (LED). [1] Lately, Eu 2+ -motivated nitride phosphors have emerged as hopeful red-emitting phosphors applied in LED on account of their excellent chemical and thermal stabilities and high PLQY (>95%). [2][3][4] Unfortunately, the broad bandwidth (≈90 nm) of commercial red phosphors resulted in a fair section of the emitted energy being outward the scope of human vision, severely degrading the luminous efficiency (LE) of the LED.…”

“…[2][3][4] Unfortunately, the broad bandwidth (≈90 nm) of commercial red phosphors resulted in a fair section of the emitted energy being outward the scope of human vision, severely degrading the luminous efficiency (LE) of the LED. [1] To our delight, colloidal perovskite nanocrystals (NCs) or quantum dots (QDs) have been successfully synthesized and value reported till now. And the PL intensity showed that there was no evident variation and could still maintain above 90% even soaked in water for 30 d. [20] Here, by optimizing the composition of boro-zinc silicon glass, a series of CsPb(Br/I) 3 NCs glasses with high PLQY value were obtained via traditional melt-quenching and subsequent heat treatment for the first time.…”

“…[ 2–4 ] Unfortunately, the broad bandwidth (≈90 nm) of commercial red phosphors resulted in a fair section of the emitted energy being outward the scope of human vision, severely degrading the luminous efficiency (LE) of the LED. [ 1 ] To our delight, colloidal perovskite nanocrystals (NCs) or quantum dots (QDs) have been successfully synthesized and manifested prominent optical performance, such as extreme narrow full width at half maximum (FWHM), high PLQY (up to 90%), tunable emissive color covering a visible full‐spectral range, and high defect tolerance over the past decade, rendering them high value for applications in LED. [ 5–11 ] But on the other hand, the intrinsic instability of perovskite quantum dots (PQDs) poses a threat to further development against the water and thermal.…”

Efficient red and broadband near‐infrared luminescence in Mn2+/Yb3+‐doped phosphate phosphor

“…Recently, pc‐WLEDs have attracted extensive attention as a new generation of solid‐state lighting equipment, which is displacing the traditional incandescent, mercury, and fluorescent lamps due to their advantages of low energy consumption, high efficiency, environment friendly, and long service time 5‐11 . Currently, the main commercial WLEDs are to combine a 460 nm emitting LED chip and a yellow‐emitting YAG:Ce 3+ phosphor 12‐16 . However, this combination suffers from the disadvantages of high correlated color temperature (CCT) and low color rendering index (Ra) because of insufficient red light components 17‐20 .…”

“…[5][6][7][8][9][10][11] Currently, the main commercial WLEDs are to combine a 460 nm emitting LED chip and a yellow-emitting YAG:Ce 3+ phosphor. [12][13][14][15][16] However, this combination suffers from the disadvantages of high correlated color temperature (CCT) and low color rendering index (Ra) because of insufficient red light components. [17][18][19][20] Another alternative means for obtaining white light is by combining near ultraviolet LED (n-UV-LED) chips with tricolor phosphors.…”