Tandem structures with different subpixels are promising for perovskite-based multicolor electroluminescence (EL) devices in ultra-high-resolution full-color displays; however, realizing excellent luminance- and color-independent tunability considering the low brightness and stability of blue perovskite light-emitting diodes (PeLEDs) remains a challenge. Herein, a bright and stable blue gallium nitride (GaN) LED is utilized for vertical integration with a green MAPbBr₃ PeLED, successfully achieving a Pe-GaN tandem LED with independently tunable luminance and color. The electronic and photonic co-excitation (EPCE) effect is found to suppress the radiative recombination and current injection of PeLEDs, leading to degraded luminance and current efficiency under direct current modulation. Accordingly, the pulse-width modulation is introduced to the tandem device with a negligible EPCE effect, and the average hybrid current efficiency is significantly improved by 139.5%, finally achieving a record tunable luminance (average tuning range of 16631 cd m⁻² at an arbitrary color from blue to green) for perovskite-based multi-color LEDs. The reported excellent independent tunability can be the starting point for perovskite-based multicolor EL devices, enabling the combination with matured semiconductor technologies to facilitate their commercialization in advanced display applications with ultra-high resolution.

中文翻译：

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具有改进的亮度和颜色可调性的钙钛矿-氮化镓串联发光二极管


具有不同子像素的串联结构有望用于超高分辨率全彩显示器中基于钙钛矿的多色电致发光（EL）器件；然而，考虑到蓝色钙钛矿发光二极管（PeLED）的低亮度和稳定性，实现出色的与亮度和颜色无关的可调性仍然是一个挑战。在此，利用明亮稳定的蓝色氮化镓（GaN）LED与绿色MAPbBr ₃ PeLED进行垂直集成，成功实现了具有独立可调亮度和颜色的Pe-GaN串联LED。研究发现，电子和光子共激发 (EPCE) 效应会抑制 PeLED 的辐射复合和电流注入，导致直流调制下的亮度和电流效率下降。因此，在EPCE效应可以忽略不计的情况下，将脉宽调制引入到串联器件中，平均混合电流效率显着提高了139.5%，最终实现了创纪录的可调谐亮度（平均调谐范围为16631 cd m ^-2用于基于钙钛矿的多色 LED（从蓝色到绿色的任意颜色）。所报告的出色的独立可调性可以成为基于钙钛矿的多色EL器件的起点，使其能够与成熟的半导体技术相结合，以促进其在超高分辨率的先进显示应用中的商业化。