Study Of Perovskite Quantum Dot Display Array Devices

In this information society,display technology can improve the convenience and quality of people's lives.With the development of the display technology,there are higher requirements for color saturation and vividness.As a base unit,light-emitting diodes?LEDs?have become a primary object of study.Perovskite quantum dots?QDs?with high photoluminescence quantum yield?PLQY?,narrow emission and wide color gamut have attracted special attention in recent years.Up to now,perovskite QDs have been conducted with thorough studies in the optoelectronic and photovoltaic device fields.Among them,the performance of perovskite light-emitting diode?LED?has been improved rapidly.Perovskite LEDs have become a competitor to organic LEDs?OLEDs?and conventional QD LEDs?QLEDs?based on chalcogenides.Although LEDs based on perovskite exhibit excellent performance,there are few applications of perovskite LEDs in display.Herein,LEDs based on CsPbI₃ perovskite were used as basic units for fabricating eight-segment LED displays.At the beginning of the research in this paper,the application of perovskite QDs LEDs in displays is seldom.In order to solve the above problems,first,the CsPbI₃ perovskite QDs material with a red color was synthesized by the thermal injection method.By optimizing the device structure,the performance of the perovskite QDs LED is improved.Second,perovskite QDs LEDs were used as the basic unit to prepare display array devices.During the production process,though serious crosstalk problems occurred.Starting from the two aspects of concentration control and device structure debugging,a uniform8-segment digital tube was successfully obtained.The following briefly introduces the research content:?1?We have successfully synthesized CsPbI₃ perovskite QDs bythermal injection method.The absorption and luminescence peaks are located at 677 nm and 690 nm,respectively.Using it as the light-emitting layer material,the CsPbI₃ perovskite QDs LEDs were fabricated,the LEDs exhibited a luminance of 800 cd/m² and an external quantum efficiency?EQE?of 7.5%.?2?Because the device is dense and fine,it is easy to produce crosstalk.In order to overcome the problem of crosstalk,we have continued to optimize the structure of LED devices,including the selection of electrode materials,and carrier transport layer materials,and the control of ITO distance,electrode distance,and most importantly the concentration and thickness of the layers.Through continuous exploration and experiments,the CsPbI₃ perovskite QDs LEDs as the basic unit were successfully used in the display.The LEDs exhibited a luminance of 780 cd/m² and an external quantum efficiency?EQE?of 6%.This research successfully realized an application of the monochromatic perovskite QDs LEDs in the display field.It has laid a solid foundation for advancing the application process of perovskite QDs LEDs in the field of full color display.