LIVES: LED LIV and Emission Spectrum Testing Solution

W2 Laboratories2010.12.30

WWW.W2LAB.COM

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Basic Configuration Hardware

Source meter: Keithley 2400 or 2600 serial Spectrometer: Instrument Systems, Ocean Optics, or StellarNet Emission image capture: any TWAIN compatible camera Optional temperature monitor Optional switching box (multi cell reliability test)

Software Voltage, current, and pulse sweep functions Panels for manual control and fully automated test script running User configurable parameters in UI and configuration files Scripting capability for testing with different configurations Color rendering calculations for CRI and the new NIST CQS Fast data plotting tool for multi-device comparisons SQL database for R&D analysis and production SPC

System Custom design per customer requirements

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Measurement Capability DC Voltage Sweep

Up or down sweep with different compliances for forward and reverse bias User defined test points

DC Current Sweep LIV curve for up or down sweep LIV curve for arbitrary current list with emission spectrum and image

captures LIV and spectrum for user defined test points

Pulsed Current Sweep Synchronized current pulse generation and voltage & power measurements

with Keithley 2602A dual channel source meter. User configurable pulse parameters (peak, width, and duty cycle) Spectrometer synchronization

Spectrum Analysis Color quality calculations:

CRI (color rendering index), widely used CQS (color quality scale), the latest NIST development

One- or dual-peak Lorentzian fit for peaks and FWHMs

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Example – Manual and Test Panels

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Example – Script Panel

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Example – Data Review

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Who are we? Profile

Founded in 2000 3 partners with PhD in physics, EE, and robotic engineering Other loosely associated engineering members Alliances with other engineering firms in the area

MRATek,, SVOTek, OAI Capability

Custom systems: testing, automation, burn-in, life test Hardware: custom electronic boards and testing fixtures Software and firmware System integration

Industries served Photonics and optoelectronics

Diode lasers, LED, solar photovoltaic, passive optic components Others: disk drive, MEMS, and display