AI Article Synopsis
- White light-emitting diodes (WLEDs) are crucial for future lighting and display technologies, but the use of toxic Cd/Pb-based quantum dots (QDs) is a significant barrier.
- Recent developments focus on eco-friendly, phosphor-free QDs that offer better color stability, but issues like uneven light distribution hinder performance.
- The study introduces an innovative In-doping strategy in Zn-Cu-Ga-S@ZnS QDs, which achieves a balanced light output with high efficiency and long lifespan, meeting industry standards for color rendering.
Article Abstract
White light-emitting diodes (WLEDs) are the key components in the next-generation lighting and display devices. The inherent toxicity of Cd/Pb-based quantum dots (QDs) limits the further application in WLEDs. Recently, more attention is focused on eco-friendly QDs and their WLEDs, especially the phosphor-free WLEDs based on mono-component, which profits from bias-insensitive color stability. However, the imbalanced carrier distribution between red-green-blue luminescent centers, even the absence of a certain luminescent center, hinders their balanced and stable photoluminescence/electroluminescence (PL/EL). Here, an In-doped strategy in Zn-Cu-Ga-S@ZnS QDs is first proposed, and the balanced carrier distribution is realized by non-equivalent substitution and In doping concentration modulation. The alleviation of the green emitter by the In-related red emitter and the compensation of blue emitter by the Zn-related electronic states contribute to the balanced red-green-blue emitting with high PL quantum yield (PLQY) of 95.3% and long lifetime (T) of over 1100 h in atmospheric conditions. Thus, the In-doped WLEDs can achieve exceedingly slight proportional variations between red-green-blue EL intensity over time (∆CIE = (0.007, 0.009)), and high champion CRI of 94.9. This study proposes a single-component QD with balanced and stable red-green-blue PL/EL spectrum, meeting the requirements of lighting and display.
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| http://dx.doi.org/10.1002/adma.202304772 | DOI Listing |
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