Ultrawide Color Gamut Perovskite and CdSe/ZnS Quantum-Dots-Based White Light-Emitting Diode with High Luminous Efficiency

Lin, Chih Hao; Kang, Chieh Yu; Verma, Akta; Wu, Tingzhu; Pai, Yung Min; Chen, Tzu‐Yu; Tsai, Chun Lin; Yang, Ya Zhu; Sharma, Shubham; Sher, Chin Wei; Zhong, Cheng; Lee, Po Tseng; Chung, Shu Ru; Kuo, Hao Chung

doi:10.3390/nano9091314

Cited by 21 publications

(7 citation statements)

References 41 publications

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“…R-GQD/SBA-15 white LEDs with color coordinates of (0.3105, 0.3326) have a luminous efficacy of 137.6 lm W –1 at a typical injection current of 20 mA. To the best of our knowledge, this luminous efficacy is the highest recorded in reported studies using green and red QDs as the only color convertors in LEDs. ,,,,− ,− In addition, the inset shows the predictive luminous efficacy that is linearly fit according to the reported values given in Figure g. Without considering the light management of reabsorption, it may require a long time to obtain devices with a high luminous efficacy comparable with that described in this study.…”

Section: Results and Discussionmentioning

confidence: 85%

Toward 200 Lumens per Watt of Quantum-Dot White-Light-Emitting Diodes by Reducing Reabsorption Loss

Tang

Ding

et al. 2020

ACS Nano

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In this study, we analyze the influence of the pore structure of an SBA-15 particle on the light emission from its inner adsorbed quantum dots (QDs) and outer light-emitting diode (LED) chips. It is found that the particle features of a high refractive index, comparable feature size of pore structure, and lower amount of QD adsorption help with QD light extraction, demonstrating a mechanism to suppress QD light propagating through pores and thus reducing the reabsorption loss. We consequently developed highly efficient QD white LEDs with wet-mixing QD/SBA-15 nanocomposite particles (NPs) by further optimizing the packaging methods and the introduced NP mass ratio. The LEDs demonstrated a record luminous efficacy (the ratio of luminous flux to electrical power) of 206.8 (entrusted test efficiency of 205.8 lm W–1 certificated by China National Accreditation Service) and 137.6 lm W–1 at 20 mA for white LEDs integrating only green QDs and green–red QD color convertors, respectively, with improved operating stability. These results are comparable to conventional phosphor-based white LEDs, which can be a starting point for white LEDs only using QDs as convertors toward commercialization in the near future.

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Section: Results and Discussionmentioning

confidence: 85%

Toward 200 Lumens per Watt of Quantum-Dot White-Light-Emitting Diodes by Reducing Reabsorption Loss

Tang

Ding

et al. 2020

ACS Nano

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“…Generally, the EL device uses perovskite as the active emitter for lighting while PL device takes perovskite as phosphor light converter for white LED and display applications. Since ionic perovskites are relatively unstable under continuous electroluminescence excitation,35 up to date, perovskite PL converter devices normally possess longer lifetime and higher efficiency than EL devices 35–38. The ambient stability of perovskite NW arrays was also tested.…”

Section: Resultsmentioning

confidence: 99%

Giant Optical Anisotropy of Perovskite Nanowire Array Films

Lin

Kang

et al. 2020

Adv Funct Materials

102

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Polarizers play a key role in generating polarized light for display, imaging, and data communication, but adoption often suffers from high optical loss. Recently, due to superior optoelectronic properties, halide perovskites have been widely developed for lighting applications; however, highly polarized emission (polarization degree >0.8) has not yet been realized with perovskites. Herein, by incorporating inkjet printing and an anodic aluminum oxide (AAO) confinement strategy, highly ordered perovskite nanowire (NW) arrays are demonstrated for anisotropic optical applications. The optical device based on perovskite NW arrays reveals a high photoluminescence external quantum efficiency of 21.6% and emits highly polarized light with polarization degree up to 0.84. The highly polarized emission from perovskite NW arrays has potential to considerably reduce the optical loss of polarizers, which may attract great interest in developing polarized light sources for next‐generation optoelectronic applications.

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“…Luminous efficiency (LE) levels of previous white LEDs using QDs as the color converters. The star symbols are the efficiency levels achieved in this study. ,,,,− …”

Section: Discussionmentioning

confidence: 96%

High-Performance White Light-Emitting Diodes over 150 lm/W Using Near-Unity-Emitting Quantum Dots in a Liquid Matrix

et al. 2022

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In the next decade, we will witness the replacement of a majority of conventional light sources with light-emitting diodes (LEDs). Efficient LEDs other than phosphors can enhance their functionality and meet different lighting needs. Quantum dots (QDs) have high potential for future LED technology due to their sensitive band-gap tuning via the quantum confinement effect and compositional control, high photoluminescence quantum yield (PLQY), and mass-production capacity. Herein, we demonstrate white LEDs using QDs that reach over 150 lumens per electrical Watt. For that we synthesized green- and red-emitting ZnCdSe/ZnSe core/shell QDs by low-temperature nucleation, high-temperature shell formation, and postsynthetic trap-state removal. Their cadmium concentration is lower than 100 ppm, satisfying the current EU RoHS regulations, and their PLQY reaches a high level of 94%. The PLQY of QDs is maintained within the device on blue LED via liquid injection, and their integration at optimized optical densities leads to 129.6 and 170.4 lm/W for red-green-blue (RGB)- and green-blue (GB)-based white LEDs, respectively. Our simulations further showed that an efficiency level of over 230 lm/W is achievable using ultraefficient blue LED pumps. The simple fabrication and high performance of white LEDs using QD liquids show high promise for next-generation lighting devices.

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Ultrawide Color Gamut Perovskite and CdSe/ZnS Quantum-Dots-Based White Light-Emitting Diode with High Luminous Efficiency

Cited by 21 publications

References 41 publications

Toward 200 Lumens per Watt of Quantum-Dot White-Light-Emitting Diodes by Reducing Reabsorption Loss

Toward 200 Lumens per Watt of Quantum-Dot White-Light-Emitting Diodes by Reducing Reabsorption Loss

Giant Optical Anisotropy of Perovskite Nanowire Array Films

High-Performance White Light-Emitting Diodes over 150 lm/W Using Near-Unity-Emitting Quantum Dots in a Liquid Matrix

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