The co-doping of double perovskites is a useful approach in terms of improving their stability and photoluminescence quantum yield. Herein, Bi³⁺ and Te⁴⁺ cations have been co-doped into Cs₂AgInCl₆ nanocrystals. Doping with Te⁴⁺ cations promotes radiative recombination of self-trapped excitons due to increased defect formation energies of silver and indium vacancies, according to experimental and theoretical results. When used in excess, the TeO₂ precursor would generate residual TeO₂, Te₂O₃Cl₂, R₂TeO, or all three of them, which confined undesired chlorine ions on oxygen vacancies to counteract the pull from the Cs₂AgInCl₆ host, resulting in improved coordination with surface oleic acid ligands. As a result, 1% Bi and 8% Te co-doped Cs₂AgInCl₆ nanocrystals reach a high photoluminescence quantum yield of 34% and show an improved stability, maintaining over 70% of their original emission intensity after storage for more than 1 month. These findings are important in the context of producing high-performance properly doped double perovskite nanocrystals for optoelectronic applications.

中文翻译：

---

碲与铋共掺杂提高了 Cs2AgInCl6 双钙钛矿纳米晶的稳定性和光致发光量子产率

就提高其稳定性和光致发光量子产率而言，双钙钛矿的共掺杂是一种有用的方法。在此，Bi ³⁺和Te ⁴⁺阳离子共掺杂到Cs ₂ AgInCl ₆纳米晶体中。根据实验和理论结果，由于银和铟空位的缺陷形成能增加，掺杂 Te ^{4+阳离子促进了自陷激子的辐射复合。}当过量使用时，TeO ₂前体会产生残留的 TeO ₂、Te ₂ O ₃ Cl ₂、R ₂TeO，或所有三种，将不需要的氯离子限制在氧空位上以抵消来自 Cs ₂ AgInCl ₆主体的拉力，从而改善与表面油酸配体的配位。结果，1% Bi 和 8% Te 共掺杂的 Cs ₂ AgInCl ₆纳米晶体达到了 34% 的高光致发光量子产率，并显示出更高的稳定性，在储存超过 1 个月后保持其原始发光强度的 70% 以上. 这些发现对于生产用于光电应用的高性能适当掺杂的双钙钛矿纳米晶体非常重要。