[O III] to UV luminosity ratio shown as a function of the UV luminosity. The yellow star shows the upper limit on the [O III] luminosity in z7_GSD_3811 assuming a line-width of 100 km s⁻¹, while the dash and arrow show the corresponding upper limit assuming a line-width of 400 km s⁻¹. The gray circles show [O III]-detected objects at z >  7 (Inoue et al. 2016; Laporte et al. 2017; Carniani et al. 2017; Hashimoto et al. 2018, 2019a; Tamura et al. 2019; Harikane et al. 2020), while squares show the three recent detections by Harikane et al. (2020) at z ∼ 6. The UV luminosity has been calculated with lensing considered, however, the errors in the lensing magnification are not included in this figure.