Blue‐Emitting Orthorhombic Boron Nitride Quantum Dots and Quantum‐Dot Light‐Emitting Diodes

Abstract

Quantum‐dot light‐emitting diodes (QLEDs) have been considered the next‐generation display. However, the toxicity of Cd or Pb in these quantum dots (QDs) and the low performance of blue QLEDs remain critical issues, which greatly limit their sustainable development. Herein, first blue‐emitting quantum‐dot light‐emitting diode based on orthorhombic BN QDs with high photoluminescence quantum yield (PLQY) of 31.3% and electroluminescence at 437 nm is reported. With optimal solvothermal parameters, high photoluminescence quantum yield (PLQY) of 31.3% can be realized in the as‐synthesized BN QDs. The turn‐on voltage, maximum luminance, and maximum current density of these novel QLEDs are 9 V, 6.55 Cd m−2, and 34.42 mA cm−2, respectively. This work demonstrates that BN QDs have great potential for blue QLEDs with advantages of being nontoxic, Earth abundant, and having low‐cost manufacturing.

Twist-Driven Deep-Ultraviolet-Wavelength Exciton Funnel Effect in Bilayer Boron Nitride

“…Experimental realizations of quantum emitter arrays in strain textured monolayers MoS 2 and WSe 2 were reported previously by utilizing indented nanopillars, confirming the theoretical predictions of exciton funnel effect in a strain-engineered continuously varying band gap landscape. Besides, we note that recently, there are experimental efforts in realizing the quantum-dot light emitters in MoS 2 /WSe 2 heterostructures, and in hexagonal and orthorhombic boron nitride crystals, via the formation of defect states. Our work provides another general and intrinsic approach for achieving excitonic quantum dot arrays in moiré superlattices, which can be verified by photoluminescent measurements on twist-stacked exfoliated monolayer BN.…”

Tailoring optical and photocatalytic properties of sulfur-doped boron nitride quantum dots via ligand functionalization

“…In 1995, a study discussed pressureless-sintered BN with a limited content of boric oxide [33]. Furthermore, scientists investigated the tunable alkylation of white graphene (hexagonal BN) using reductive conditions [34]. Moreover, several studies have investigated the functionalization of BN edges with carboxylic groups.…”

“…Moreover, incorporating side defects and functional groups can significantly enhance the electrical and optical responses of BNQDs [24]. This enhancement unlocks a wide range of potential applications for BNQDs in cutting edge fields like nanophotonics [33], photovoltaics [34], bioimaging [35], and quantum communication [36]. In terms of photocatalysis, customizing the electronic properties of BNQDs holds tremendous promise as highly efficient photocatalysts.…”