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首页> 外文会议>Sixth International Conference on Solid State Lighting >Spectral and Luminous Efficacy Change of High-power LEDs Under Different Dimming Methods
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Spectral and Luminous Efficacy Change of High-power LEDs Under Different Dimming Methods

机译：不同调光方法下大功率LED的光谱和发光效率变化

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摘要

Dimming is an important and necessary feature for light sources used in general lighting applications. An experimental study was conducted to quantify the spectral and luminous efficacy change of high-power colored and pc-white LEDs under continuous current reduction (CCR) and pulse-width modulation (PWM) dimming schemes. For InGaN-based blue, green, and pc-white LEDs, the peak wavelength shifts were in opposite directions for the two dimming schemes. The peak wavelength showed a blue shift with increased current, most likely due to band filling and QCSE dominated effects. InGaN LEDs exhibited red shifts with increased duty cycle, which is dominated by junction heat. AlInGaP red LEDs show mainly thermal-induced red shift with increased current or duty cycle. In addition, the luminous efficacy was always higher for the CCR dimming scheme at dimmed levels, irrespective of the LED type.
机译：调光是普通照明应用中使用的光源的重要且必要的功能。进行了一项实验研究，以量化在连续电流降低（CCR）和脉宽调制（PWM）调光方案下的高功率彩色和pc白色LED的光谱和发光功效变化。对于基于InGaN的蓝色，绿色和pc白色LED，两种调光方案的峰值波长偏移方向相反。峰值波长随电流增加而显示蓝移，这很可能归因于谱带填充和QCSE主导效应。 InGaN LED呈现出随占空比增加而发生红移，这主要是结热所致。 AlInGaP红色LED主要表现为电流或占空比增加时热引起的红移。另外，CCR调光方案在调光水平下的发光效率始终更高，而与LED类型无关。

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