1：Experimental Design and Method Selection:

The study involved measuring and analyzing the electroluminescence quantum efficiency roll-off in NIR-emissive OLEDs based on Ir(iqbt)2(dpm) and Ir(iqbt)3 complexes. The double-layer solution-processed structure with emitters embedded in the PVK-OXD7 host matrix, as well as the analogous three-layer one extended by a carrier-conducting PVK film, were investigated.

2：Sample Selection and Data Sources:

The NIR-emitting complexes, Ir(iqbt)2(dpm) and Ir(iqbt)3, were synthesized according to the methods reported in the papers [10,14].

3：4]. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: The devices utilized ITO glasses with deposited 50 nm-thick films of PEDOT:PSS to form the anodes, and Ba/Al (7/100 nm) vacuum-evaporated cathodes. The active layers were formed using mixtures of PVK, OXD7, and the iridium complexes.

4：Experimental Procedures and Operational Workflow:

The device preparation processes were performed in nitrogen atmosphere using a M-Braun glovebox system. The light emitting layers for two-layer devices were fabricated using a spin-coating technique.

5：Data Analysis Methods:

The EL spectra were recorded at room temperature under a constant bias applied to the devices using a Spex CCD detector. The current–voltage (I–V) device characterization was performed with a Keithley 2602 source meter. The EQEs were determined by recording the OLED forward-direction emissions, assuming the Lambertian intensity profile.