Generation of white LED light by frequency downconversion using perylene-based dye

Perylene-embedded electrospun PS fibers for white light generation

“…A mainstream design of such a system contains a yellow phosphor, namely Cerium doped Yttrium Aluminum Oxide (YAG:Ce 3+ ), and a blue LED chip which unfortunately suffers from high CCT and low CRI due to its deficiency of red emission region. In this sense, research on introduction of new rare-earth element containing phosphors [9,10], rare-earth element free phosphors [11,12], perovskites [13,14] and organic phosphors [15][16][17][18][19][20] is continued. Among those, organic phosphors are the promising materials due to their abundancy, absorption and photoluminescence (PL) wavelength tunability, and high PL efficiency.…”

“…Perylene diimides (PDI) and their derivatives are π-conjugated materials those can be used in photovoltaic devices, sensors, LEDs, and field effect transistors due to their strong visible range absorption, high PL quantum yield, high photostability and thermal durability [15][16][17][21][22][23][24][25][26][27][28][29][30]. However, the PL color of regular PDIs is limited with yellow region and their PL is quenched in their films and solid states due to intermolecular π-π interactions.…”

Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review

“…Although the above-mentioned struggles in using CDs for LED color conversion (more complex process for long-wavelength emissions, relatively low values of QY, poor luminous efficiency), compared to other organic converter or dyes, CDs seem to be highly promising as phosphors for LEDs due to their high photoluminescence stability. Generally, the Achille’s heel of dyes used for lighting purposes is their poor stability and photobleaching [ 142 , 143 , 144 ]. On the contrary, CDs have been proven to be highly stable over long periods of time, and also resistant to high currents (no changes in 72 h at 90 mA [ 145 ]).…”

Creation of effective sources of white radiation based on GaP(As,N) on silicon substrates

“…Despite the fact that the described technology has revolutionized the lighting industry, the materials used, for example, yttrium in the luminophore, are quite rare and expensive. In addition, the absorption of shortwave radiation by a fluorescent material and conversation it into longer wavelength radiation in the visible range leads to energy losses associated with a small Stokes shift of the luminophore [1].…”