Hi-QE Photocathodes

Photonis’ Hi-QE photocathode technology provides a unique combination of extremely low dark counts, fast response time, and high quantum efficiency.

High sensitivity efficiency
High collection efficiency
Low noise
Long life
Wide variety of formats

Technical information

Photonis offers the Hi-QE photocathode option in four versions: UV, blue, green and red.

	QY at 200nm, %		QY at 270nm, % Y		QY at 400nm, %
	Minimum	Typical	Minimum	Typical	Minimum	Typical
Hi-QE UV	22	25	28	32	22	25
Hi-QE UV	12	16	27	30	27	30

	Averaged QY [380-480nm], %		QY at 500nm,%
	Minimum	Typical	Minimum	Typical
Hi-QE Green	26	30	18	22

	Averaged QY [520-800nm], %s
Hi-QE Red	15	17

Description

Hi-QE photocathodes are available in a variety of spectral detection ranges to fulfill specific application requirements.

Hi-QE photocathodes lower dark counts as much as 10X, while boosting QE 50% over traditional S20 or S25 photocathode technologies.

Photonis' Hi-QE photocathodes are available in four options, designed to heighten the spectral response across specific wavelengths when compared to broader spectral response photocathodes of S20 and S25. The Hi-QE UV offers superior detection to 330nm, while the Hi-QE blue provides improved response through 400mn. The Hi-QE green option provides unparalleled response from 400-550 nm, while the new Hi-QE Red photocathode is optimized for the 400-900nm spectral range, providing 50% greater quantum efficiency. At 650nm, Hi-QE Red provides 22% QE - versus 16% in the standard S25 photocathode. Notably, at 900nm the Hi-QE red photocathode offers a 50% improvement over the traditional S25 photocathode.