The non-radiative electron transitions of Quantum dots (QDs) in White light-emitting diodes (WLEDs) not only generates thermal phonons with temperature rise but also degrades their photonic properties. These nanoscale heat sources are usually embedded in low-thermal-conductivity polymer matrix, which is difficult for building efficient heat dissipation pathways without sacrificing the optical performance simultaneously. Herein, we reported an air-bubbles-assembly strategy to construct three-dimensional (3D) thermal dissipation network inside the QDs-WLEDs. Owing to the lateral expulsion of massive microscale air-bubbles, an interconnected hexagonal boron nitride (hBN) network was established under an extremely low hBN loading of 2.74 wt%. With this efficient 3D/hBN network, the highest working temperature of QDs was dramatically decreased by 57.3°C at 700 mA. More than that, the 3D/hBN-WLEDs also show high luminous efficacy of 84.6 lm/W as well as superior color rendering index of Ra = 94.1 and R9 = 93.8, which are comparable to those of traditional WLEDs. The proposed strategy is expected to pave a new door for targeting cooling QDs and other photoluminescent nanoparticles at high-power applications.

白光发光二极管 (WLED) 中量子点 (QD) 的非辐射电子跃迁不仅会随着温度升高产生热声子，而且还会降低其光子特性。这些纳米级热源通常嵌入低导热性聚合物基体中，这很难在不牺牲光学性能的情况下构建有效的散热路径。在此，我们报告了一种气泡组装策略，以在 QDs-WLED 内部构建三维 (3D) 散热网络。由于大量微尺度气泡的横向排出，在 2.74 wt% 的极低 hBN 负载下建立了互连的六方氮化硼 (hBN) 网络。借助这种高效的 3D/hBN 网络，量子点的最高工作温度显着降低了 57。700 mA 时为 3°C。不仅如此，3D/hBN-WLED 还表现出 84.6 lm/W 的高光效以及 Ra = 94.1 和 R9 = 93.8 的卓越显色指数，可与传统 WLED 相媲美。所提出的策略有望为在高功率应用中瞄准冷却量子点和其他光致发光纳米粒子铺平一扇新的大门。