ArticleSmall methods2026
Top-Down Synthesis of Wurtzite Gallium Nitride Colloidal Quantum Dots via Defect-Driven Fragmentation.
Article in Small methods, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The synthesis of colloidal gallium nitride (GaN) quantum dots (QDs) is limited by the instability of organic ligands at the high GaN crystallization temperatures. Here, we report a top-down, defect-driven fragmentation strategy that yields high-purity colloidal GaN QDs at 50°C and ambient pressure. This process is facilitated by nitrogen-containing organic solvents, which we propose lower the energy barrier for native point defect segregation to the crystal surface, thereby promoting controlled structural subdivision. Defect extraction is supported by the progressive suppression of deep-level defect luminescence and the emergence of sharp, quantum-confined emission with a full width at half maximum of 38.8 nm. Direct observation of crystal fragmentation via identical-location transmission electron microscopy corroborates the mechanism. Post-synthesis analysis reveals extensive crystallite subdivision and the formation of surface Ga
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