Inorganic cesium lead halide (${\text{CsPbX}}_3$, $\mathrm{X}=\mathrm{Cl}$, Br, I) nanocrystals (NCs) attract extensive attention because of their excellent optoelectronic performance. However, the classic ${\text{CsPbX}}_3$ NCs suffer from toxicity and instability, which impede their further applications in commercial fields. Here the inorganic lead-free cesium copper chlorine NCs are synthesized by a facile hot-injection method. The blue-emission 3D ${\mathrm{CsCu}}_2{\mathrm{Cl}}_3$ and green-emission 0D ${\mathrm{Cs}}_3{\mathrm{Cu}}_2{\mathrm{Cl}}_5$ NCs are prepared at 70°C and 120°C, respectively, suggesting that the reaction temperature may account for the final components. Owing to the self-trapped exciton effect, the unique optical properties, such as high photoluminescence (PL) quantum yield, broadband emission, large Stokes shift, and long PL decay time, are demonstrated for both cesium copper chlorine NCs. Moreover, highly efficient and stable warm white light-emitting diodes are fabricated with ${\mathrm{CsCu}}_2{\mathrm{Cl}}_3$ and ${\mathrm{Cs}}_3{\mathrm{Cu}}_2{\mathrm{Cl}}_5$ NCs. The study highlights the promising potential for lead-free cesium copper chlorine nanocrystals in nontoxic solid-state lighting applications.

中文翻译：

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无机无铅铯铜氯纳米晶体，用于高效稳定的暖白色发光二极管

无机卤化铯铯（${\text{CsPbX}}_3$， $\mathrm{X}=氯$，Br，I）纳米晶体（NC）由于其出色的光电性能而受到广泛关注。但是，经典${\text{CsPbX}}_3$NCs具有毒性和不稳定性，这阻碍了它们在商业领域的进一步应用。在此，通过简便的热注入法合成了无机无铅铯铜氯NCs。蓝光发射3D${\mathrm{铜铜}}_2{氯}_3$ 和绿色发射0D ${\mathrm{Cs}}_3{铜}_2{氯}_5$NC分别在70°C和120°C下制备，表明反应温度可能是最终组分的原因。由于自陷激子效应，两种铯铜氯NCs都表现出独特的光学性质，例如高光致发光（PL）量子产率，宽带发射，大斯托克斯位移和长PL衰减时间。此外，还制造了高效，稳定的暖白色发光二极管${\mathrm{铜铜}}_2{氯}_3$ 和 ${\mathrm{Cs}}_3{铜}_2{氯}_5$NCs。这项研究强调了无铅固态铯铜氯纳米晶体在无毒固态照明应用中的潜力。