Graphical Abstract
![](https://wqketang.oss-cn-beijing.aliyuncs.com/unzip/large-zip/zip-d46fa870-bd16-42a3-b705-003bb4e85cce/5922/files/5922-TOC.jpg?Expires=1725756153&OSSAccessKeyId=STS.NSssK71aLjDMY9SbRgGRGskMT&Signature=AFVbnYIJvsXmDWsli%2B%2F0t2QDBg8%3D&security-token=CAISywJ1q6Ft5B2yfSjIr5DGOPGD3L5t3YamWx%2FihlIyS91rnK7mtjz2IHtKenhsBOsbtfk1mG5W5%2FgZlqJ9SptIAEfJa9d99Myjb%2F9FltCT1fau5Jko1beHewHKeTOZsebWZ%2BLmNqC%2FHt6md1HDkAJq3LL%2Bbk%2FMdle5MJqP%2B%2FUFB5ZtKWveVzddA8pMLQZPsdITMWCrVcygKRn3mGHdfiEK00he8TouufTinpHMskGA1Aell7Mvyt6vcsT%2BXa5FJ4xiVtq55utye5fa3TRYgxowr%2Fwo0v0YpGya5YzHXwcPskvdKZbo78UqLQlla6w%2BGqFJqvPxr%2Fp8t%2Fx5fWJKAezhVgs8cVM8JOjIqKOscIsixo262SmqFV55c8Fdm%2BgUooJVgIMhTnduUfAPJAGOxzJitP%2BUVGGphr60TEnBL4rB5MUctfzRpwT64j3UTzDnGoABhFRSspTLrn9GrEN9pQYzC6eepGdfWDQh3fr5hA1VnwVUJMCz%2BNQEDWKceF%2FnEjWVMtfbvqYxuyhSCmIMMyh5bEREEKEiD%2BFVv4ZfsqnV7hQy5w6HhIkN8kZzP6L0zPvPgkBLOtdMDeDxhf8dVPrCSG4etXHjxcwUaRVb3ZR7Yu8gAA%3D%3D)
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Construction of lead halide perovskite nanocrystals (LHP NCs) heterostructures is essential to obtain highly stable photoluminescence and expand their applications. Herein, a novel self-assembly strategy combining with a solvent-free thermal-assisted synthesis and a water-triggered reaction is developed to subsequently grow BaWO4/CsPbX3/CsPb2X5 (X = Cl, Br, I) heterostructures at low nucleation temperature with high crystallinity. The as-obtained ternary BaWO4/CsPbX3/CsPb2X5 (X = Cl, Br, I) heterostructures exhibit remarkably enhanced panchromatic emission and ultrastable luminescence ascribing to the low-defect growth based on lattice matching. Stable white light-emitting diodes (WLEDs) have been constructed with a high correlated color temperature (CCT) of 7225 K and luminous efficiency of 74.4 lm·W−1. Ln3+-doped BaWO4/CsPbX3/CsPb2X5 (Ln3+ = Eu3+, Tb3+, Dy3+, Sm3+, Yb3+/Er3+) nanocomposites are further designed with excitation-dependent photoluminescence and thermochromic properties, making them excellent candidates for high-level anti-counterfeiting and encryption. This work offers a green and universal approach in assembling CsPbX3 (X = Cl, Br, I) on lattice-matched tungstate with adjustable panchromatic emission for versatile optical applications.
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