LED Binning Explained: What Is Spectral Color Separation & Why Color Variation Occurs

发布于: 2026-08-12 09:40

同一批货,装在同一个面板上,十颗绿灯里有两颗明显偏黄、一颗明显偏暗——这种问题几乎每个用灯珠的设备厂都遇到过。根源不在你的焊接工艺,而在灯珠出厂前有没有做分光分色(Bin 分选),以及分得多细。

这篇从封装厂内部视角,讲清分光分色是怎么回事,以及采购时该向厂家要什么数据。

一、为什么灯珠天生就有差异

LED 芯片是晶圆上长出来的,同一片晶圆不同位置的芯片,波长、亮度、电压天然存在离散。封装成灯珠后,离散进一步放大:

  • 波长:同一批红光灯珠,主波长可能分布在 615-630nm,相差 5nm 肉眼即可分辨
  • 亮度(IV):同一批 0805 绿灯,发光强度可能从 200mcd 跨到 500mcd
  • 正向电压(VF):同批可能 1.9-2.3V 都有

不分选直接混装出货,就是你看到的"一板灯花花绿绿"。

二、分光分色是怎么做的

分光分色机对每颗灯珠通电,毫秒级测出亮度、主波长、电压三项数据,然后按预设档位自动分拣到不同料仓。每个档位就是一个 Bin

以我们弘呈光电 0805 纯绿灯珠的实际分档为例:

参数 分档方式 典型 Bin 宽
亮度 IV 每档 1:1.2-1:1.4 如 300-360mcd、360-430mcd
主波长 每档 1-2.5nm 如 520-522.5nm、522.5-525nm
电压 VF 每档 0.05-0.1V 如 3.0-3.1V、3.1-3.2V

Bin 宽越窄,同批一致性越好,分选损耗也越大、成本越高。 这就是为什么"同型号同品牌"不同渠道买到的灯珠一致性天差地别——你买到的可能是宽 Bin,也可能是别人挑剩的尾数 Bin。

三、不同应用,该要多窄的 Bin

  • 同一面板多灯并排(充电桩、储能柜、仪表):波长 Bin ≤2.5nm,亮度比 ≤1:1.2,并排无色差
  • 单灯状态指示:波长 Bin 可放宽到 5nm,亮度比 1:1.4 够用
  • 背光/照明:重点看色温 Bin(白光 SDCM ≤3 步阶,高端要求 ≤2)
  • 交通信号、车规:按行业标准锁定波长范围,通常要求最严

采购写法示例:"0805 纯绿,主波长 520-525nm,单 Bin 宽 ≤2.5nm,亮度 300-400mcd 单档出货"——把这句话写进采购规格书,一致性就有了合同级保障。

四、分光分色和光衰、可靠性的关系

分选解决的是"出厂一致性",光衰解决的是"时间一致性",但两者强相关:

  • 分光分色机的测试工位同时可剔除暗点、漏电、VF 异常的隐患颗粒,相当于多一道全检
  • 正规分选流程会配套老化测试(常温点亮 8-24 小时抽测/全测),把早期失效颗粒在出厂前筛掉
  • 跳过老化只做分光的厂家,出厂数据漂亮,装机三个月照样死灯

所以选厂家时问两个数据就够了:分光 Bin 宽多少?出货前老化多久? 敢给具体数字的,一般不会差。

五、关于光衰的参考标准

行业常规判断口径(20mA 额定驱动、25℃ 环境):

时间 优质品光衰 合格线 劣质品表现
1000 小时 ≤3% ≤5% >10% 或出现死灯
5000 小时 ≤8% ≤15% >30%,明显变暗
10000 小时 ≤12% ≤20% 大面积发黄、发黑

要求厂家提供 LM-80 报告或自有老化房的长测数据,比任何宣传语都可信。

六、FAQ

Q:分选过的灯珠单价贵多少?

视 Bin 宽要求,通常比分选前的统货高 10%-30%。但算总账:返工一次面板的工时费远超灯珠差价。

Q:能不能买统货自己上机分选?

理论可以,实际不划算——人工分选一致性远不如机分,且没有光谱数据你只能按肉眼分。

Q:同一 Bin 的灯珠用在不同批次订单,能保证跨批一致吗?

可以,前提是厂家锁定同一芯片供应商+同一 Bin 定义。这也是我们给客户建"项目专属 Bin 档案"的原因——续单直接按档案出货。

七、小结

色差的根源是芯片天然离散,解药是窄 Bin 分选 + 老化筛选。采购时把"波长 Bin 宽、亮度分档、老化时长、光衰数据"四个指标写进规格书,一致性就有保障。

弘呈光电全系列灯珠按窄 Bin 分光分色出货(波长 Bin 最窄 1nm),出货前 24 小时老化全测,支持项目专属 Bin 档案管理。样品和分档数据表欢迎索取:139 2571 4318(微信同号),sales@led-hc.com。

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Frequently Asked Questions (FAQ)

1. Can I get free LED samples from Hongcheng Optoelectronics?

Yes. Dongguan Hongcheng Optoelectronics Co., Ltd. supports sample testing — you can verify electro-optical parameters, dimensions and soldering compatibility before placing bulk orders. To request samples, call +86 139 2571 4318 (WeChat same number) or email sales@led-hc.com with the model and quantity you need.

2. What is the minimum order quantity (MOQ)?

The MOQ for DIP (through-hole) LEDs is 1K (1,000 pcs); for SMD LEDs the MOQ is 3-5K, shipped in tape-and-reel packaging. The MOQ for customized models (special wavelength, brightness or voltage binning) is confirmed per custom solution. Please contact sales for an accurate quotation and MOQ for your model.

3. What are the lead times for samples and mass production?

Sample lead time is typically 3-4 working days; in-stock samples are usually shipped within 2 working days. Mass production lead time is typically 10-15 working days, confirmed according to order quantity and production schedule — please contact sales for an accurate lead time.

4. Are the products RoHS certified?

Yes. All Hongcheng LED diodes are RoHS and CE certified, made with A-grade chips, 99.9% pure gold wire bonding and high-temperature resistant encapsulant — anti-sulfuration and low light decay, meeting the environmental and reliability requirements of home appliance, automotive and industrial equipment applications.

5. Can voltage, wavelength, brightness or color be customized?

Yes. We support binning and customization of brightness, wavelength, voltage and color, and provide OEM services. Our product range covers 0201-5730 SMD LEDs, addressable RGB LEDs with built-in IC, side-emitting LEDs, and 2mm-10mm DIP LEDs, packed in vacuum moisture-proof tape and reel, suitable for automated SMT mounting and reflow soldering.

6. How do I get the product datasheet?

Every model has an official PDF datasheet (electro-optical parameters, dimensions, pad design, tape packaging and reliability test data) — 259 datasheets in total, all free to download with no login required. Browse the datasheet center (https://www.hc-led168.com/datasheets) by series, or download directly from each product page.

7. Is Hongcheng Optoelectronics a factory or a trading company?

Hongcheng Optoelectronics is a member of Guangyu Group — a professional LED diode source manufacturer based in Dongguan, Guangdong, China, with 20+ years of LED packaging experience. Factory-direct sales; over 50% of raw materials are imported from South Korea, Japan and Taiwan, China. Quality and lead time are controlled directly by the factory.