The emission wavelength of InGaN/GaN dot-in-wire LED can be tuned by modifying the nanowire diameter,but it causes mismatched angular distributions between blue,green,and red nanowires because of the excitation of dif...The emission wavelength of InGaN/GaN dot-in-wire LED can be tuned by modifying the nanowire diameter,but it causes mismatched angular distributions between blue,green,and red nanowires because of the excitation of different waveguide modes.Besides,the far-field radiation patterns and light extraction efficiency are typically calculated by center dipoles,which fails to provide accurate results.To address these issues,we first compare the simulation results between central dipole and dipole cloud with experimental data.Next,we calculate and analyze the display metrics for full-color nanowire LEDs by 3D dipole cloud.Finally,we achieve unnoticeable angular color shift within±20°viewing cone for augmented reality(AR)and virtual reality(VR)displays with an improved light extraction efficiency.展开更多
In this paper, progresses of color maintenance, also known as color shift, in solid-state lighting(SSL) systems are thoroughly reviewed. First, color shift is introduced and a few examples are given from different rea...In this paper, progresses of color maintenance, also known as color shift, in solid-state lighting(SSL) systems are thoroughly reviewed. First, color shift is introduced and a few examples are given from different real-life industrial conditions. Different degradation mechanisms in different parts of the system are also explained. Different materials used as lenses/encapsulants in light-emitting diode(LED)-based products are introduced and their contributions to color shift are discussed. Efforts put into standardization, characterizing, and predicting lumen maintenance are also briefly reviewed in this paper.展开更多
文摘The emission wavelength of InGaN/GaN dot-in-wire LED can be tuned by modifying the nanowire diameter,but it causes mismatched angular distributions between blue,green,and red nanowires because of the excitation of different waveguide modes.Besides,the far-field radiation patterns and light extraction efficiency are typically calculated by center dipoles,which fails to provide accurate results.To address these issues,we first compare the simulation results between central dipole and dipole cloud with experimental data.Next,we calculate and analyze the display metrics for full-color nanowire LEDs by 3D dipole cloud.Finally,we achieve unnoticeable angular color shift within±20°viewing cone for augmented reality(AR)and virtual reality(VR)displays with an improved light extraction efficiency.
基金project (M71.9.10380) in the framework of the Research Program of the Materials Innovation Institute M2i (www.m2i.nl)
文摘In this paper, progresses of color maintenance, also known as color shift, in solid-state lighting(SSL) systems are thoroughly reviewed. First, color shift is introduced and a few examples are given from different real-life industrial conditions. Different degradation mechanisms in different parts of the system are also explained. Different materials used as lenses/encapsulants in light-emitting diode(LED)-based products are introduced and their contributions to color shift are discussed. Efforts put into standardization, characterizing, and predicting lumen maintenance are also briefly reviewed in this paper.
