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Solid‐state near‐infrared (NIR) light‐emitting devices have recently received considerable attention as NIR light sources that can penetrate deep into human tissue and are suitable for bioimaging and labeling. In addition, solid‐state NIR light‐emitting electrochemical cells (LECs) have shown several promising advantages over NIR organic light‐emitting devices (OLEDs). However, among the reported...