Fig. 4: Characterization of the QD-integrated full-color μ-LED display.
From: Quantum dot-integrated GaN light-emitting diodes with resolution beyond the retinal limit
a Photographic image of the wafer with an ultrafine pixel micro-LED array. b, c Microscopic images of the R/G single QD patterns under UV light with 10 and 5 μm pixels, respectively. All scale bars denote 20 μm. d A microscopic image of R/G double QD patterns under UV light. e A microscopic image of RGB pixels for the QD-integrated μ-LED arrays. f Schematic of the QD color conversion process. g PL spectra of the green/red QD layers. h Absorbance of the blue light from the LED as a function of QD film thickness. The absorbance is measured by subtracting the transmitted blue light power from the incident blue light power. i Normalized light power intensities of the absorbed blue light, emitted green light, and transmitted blue light as a function of the green QD film thickness. The EQE saturates as the QD thickness increases. j EQE and IQE as a function of the QD film thickness for both green and red QDs.
