Tuning shades of white light with multi-color quantum-dot–quantum-well emitters based on onion-like CdSe–ZnS heteronanocrystals

Abstract

We present white light generation controlled and tuned by multi-color quantum-dot-quantum-well emitters made of onion-like CdSe/ZnS/CdSe core/shell/shell heteronanocrystals integrated on InGaN/GaN light-emitting diodes (LEDs). We demonstrate hybrid white LEDs with (x, y) tristimulus coordinates tuned from (0.26, 0.33) to (0.37, 0.36) and correlated color temperatures from 27 413 to 4192 K by controlling the number of their integrated red-green-emitting heteronanocrystals. We investigate the modification of in-film emission from these multi-layered heteronanocrystals with respect to their in-solution emission, which plays a significant role in hybrid LED applications. Our proof-of-principle experiments indicate that these complex heteronanocrystals hold promise for use as nanoluminophors in future hybrid white LEDs.

Ag colloids and arrays for plasmonic non-radiative energy transfer from quantum dots to a quantum well

“…Hybrid semiconductor structures of quantum dots (QDs) and quantum wells (QWs) can play a large role in optoelectronic devices for photovoltaics [1][2][3], white light generation [4][5][6], and color conversion [7][8][9][10]. QDs provide the capability to collect sunlight over the full visible spectrum, and into the infrared [11][12][13], and InGaN/GaN QWs are also studied as a promising avenue for solar cell technology [14,15].…”

Multi-layered CdSe/ZnS/CdSe heteronanocrystals to generate and tune white light

“…The additional red shift of shell in comparison with the core is due to delocalization of excitons in the shell over other coupled shells. At this point, it is also worth discussing that, though these onion-like heteronanocrystals have been previously [11] and also in our works [13][14][15] shown to exhibit multi-color emission in solutions and in films, a further study on a singlenanocrystal level needs to be conducted to verify the multiple nature of this emission from single nanocrystals. However, these present discussions will still remain valid regardless the single heteronanocrytals exhibit multiple color emission or not.…”

“…However, for white light generation, using these heteronanocrystals in solution is not sufficient for the potential application in solid state lighting. Therefore, optical properties of such heteronanocrystal luminophors in the solid form need to be carefully analyzed to understand and control the photometric properties of the generated white light.In this study, we present tuneable white light generation by controlling CdSe/ZnS/CdSe core/shell/shell heteronanocrystals integrated on InGaN/GaN light emitting diodes [13][14][15]. These multi-layered quantum dots, also known as onion-like heterostructures, are designed and synthesized to emit in red (around 600 nm) from the CdSe core and in green (around 550 nm) from the CdSe shell.…”

“…In this study, we present tuneable white light generation by controlling CdSe/ZnS/CdSe core/shell/shell heteronanocrystals integrated on InGaN/GaN light emitting diodes [13][14][15]. These multi-layered quantum dots, also known as onion-like heterostructures, are designed and synthesized to emit in red (around 600 nm) from the CdSe core and in green (around 550 nm) from the CdSe shell.…”

Multi-Color Emission in Quantum-Dot-Quantum-Well Semiconductor Heteronanocrystals

“…Recent experiments indicate that multi-color emitters like (CdSe)ZnS)CdSe (QDQW) heteronanostructures integrated on LEDs hold promise for use as nanoluminophors in future white LEDs (WLEDs) [7,8].…”