Carbon dots (CDs) phosphors in white laser diodes (WLD) have the advantages of sufficient surface functionalization sites and low cost. Specially, their color rendering index (CRI) in WLD is unsatisfactory due to the uncontrollable synthesis process and low thermal stability. Herein, surface nitrogen‐containing groups of CDs are synthesized from phenylenediamine isomers and trimeric acid, and the optical and thermal properties of CDs are modulated by introducing amide bonds (–CONH). By varying the phenylenediamine isomers, CDs synthesized from o‐phenylenediamine, m‐phenylenediamine, and p‐phenylenediamine emit different fluorescence peaks at 534, 498, and 434 nm, respectively. Further investigation shows that the increase of –CONH and adjacent –NH2 favors the reduction of bandgap, which in turn induces redshifted emission. The green‐emitting CDs are also found to be thermally stable at high –CONH contents up to 10.35%. Finally, by assembling the fluorescent film with 450 nm laser diode, WLD with color coordinates of (0.3767, 0.3540), correlated color temperature of 3924 K, and CRI of 87 is realized, and its CRI reaches the advancing value for single phosphors‐based WLD devices. This work will lay the theoretical and experimental foundation for the realization of the low‐cost, high photothermal stability, high‐color‐rendering‐index CDs‐based laser lighting devices.

中文翻译：

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由具有高光热稳定性的酰胺官能化碳点荧光粉实现的白色激光照明二极管显色指数高达 87

白色激光二极管（WLD）中的碳点（CD）荧光粉具有表面功能化位点充足且成本低廉的优点。特别是，由于合成过程不可控和热稳定性低，它们在WLD中的显色指数（CRI）并不令人满意。在此，CDs的表面含氮基团由苯二胺异构体和三聚酸合成，并通过引入酰胺键（-CONH）来调节CDs的光学和热性能。通过改变苯二胺异构体，合成 CD哦‐苯二胺，米‐苯二胺，和p‐苯二胺分别在 534、498 和 434 nm 处发出不同的荧光峰。进一步研究表明-CONH和相邻的-NH的增加2有利于带隙的减小，进而引起红移发射。研究还发现，发射绿光的 CD 在 –CONH 含量高达 10.35% 的情况下具有热稳定性。最终，通过与450 nm激光二极管组装荧光膜，实现了色坐标为（0.3767，0.3540）、相关色温为3924 K、显色指数为87的WLD，其显色指数达到了单一荧光粉基的先进值。 WLD 设备。这项工作将为实现低成本、高光热稳定性、高显色指数的基于CD的激光照明器件奠定理论和实验基础。