A novel strategy for suppressing blue light hazards of white light-emitting diodes by using transparent bamboo

- Light-emitting diode (LED) has become the most popular lighting device in the world, but the harm of blue light brought by LEDs still remains a very important problem. The natural bamboo possesses a unique hierarchical structure and can be treated as an optical management material applied in the photoelectric device after the treatment of lignin removal or lignin modification. In this paper, we have discovered that the blue light hazards of white LEDs can be effectively suppressed after introducing the transparent bamboo (TB) based on above treatment. Five types of white LEDs are adopted for performing this study, and more than 27 % decrease of blue light hazard efficiency can be found after covering the TB processed by lignin modification and polymer impregnation, although more or less optical loss happens. This fact may be attributed to different light scattering effects of TB in the blue band and others in the visible range. After that, the circadian effects of two types of white LEDs (warm white and neutral white) while the TB is covered on them are also discussed. This work provides an effective method for suppressing blue light hazards, regulating circadian effects, and maintaining the color performance of LED lighting as much as possible.