Abstract

A heterojunction consisting of poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-(4,4′-(N-(4-butylphenyl)))] (TFB) and aluminum tris(8-hydroxyquinolinate) (${\mathrm{Alq}}_3$) is applied for fabricating an organic light-emitting photodetector (OLEP), where TFB and ${\mathrm{Alq}}_3$ behave as an ultraviolet response center and a green light emitter, respectively. The OLEP shows a detectivity of $1.4\times {10}^{11}$ Jones and a luminance of $11,569\mathrm{cd}/{\mathrm{m}}^2$. Thermal active delay fluorescent material is introduced in the TFB matrix to improve photodetection property. As a result, the optimized device exhibits a 2857% boost in a maximum detectivity of $4.0\times {10}^{12}$ Jones without trading off the electroluminescence performance, exhibiting a high luminance of $13,737\mathrm{cd}/{\mathrm{m}}^2$.

© 2018 Optical Society of America

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