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High-energy blue excitons often lead to material degradation, particularly at the host-guest interface.

The host material incorporates a rigid silicon-locked framework to prevent molecular rotation and improve heat resistance. 124694

Experimental data confirms that the dual encapsulation method significantly extends the T50cap T sub 50 124694

The silicon-locked host enables highly efficient blue emission with minimized non-radiative loss. 124694

The inclusion of phosphine oxide groups enhances electron-transporting properties, ensuring a balanced charge injection within the device. 3. Device Fabrication and Strategy