NOVELTY - A Schiff base-type compound (I), (II) or (III), is new.    USE - New Schiff base-type compound is used for pigment material for color conversion layer and light absorption layer used for color conversion filter, light absorption filter and color conversion light-emitting device for photoelectric conversion device (all claimed). Uses include but are not limited to illumination, image sensor, personal computer, word processor, car navigation, florescent lamp, solar cell, mobile telephone, industrial measuring device and audio equipment.    ADVANTAGE - The Schiff base-type compound has excellent fluorescence intensity and color conversion efficiency.    DETAILED DESCRIPTION - A Schiff base-type compound of formula (I), (II) or (III), is new.    ring A=aromatic ring, aliphatic ring or heterocyclic ring;    Ar'=5-membered or 6-membered heterocyclic ring, or aromatic ring;    X=halo;    or ring A+Ar'=optionally substituted condensed ring;    R1-R4=H, halo, nitro, cyano, hydroxy, carboxy, -NRR', or 1-20C alkyl, 6-20C aryl, 4-20C heterocyclic ring or 7-20C aralkyl (all optionally substituted);    or R1+R2,R2+R3,R3+R4=aromatic ring, aliphatic ring or heterocyclic ring;    R,R'=1-20C alkyl or 6-20C aryl;    or R+R'+R1-R4=ring;and    or R1-R4+adjacent aromatic ring=optionally substituted condensed ring.    (i) Bonding of methylene group of alkyl, aralkyl and aryl of R1-R4 is carried out through -O-, -S-, -SO2-, -CO-, -OCO- or -COO-. INDEPENDENT CLAIMS are included for the following:    (1) color conversion filter, which has color conversion layer (20B,20G,20R);    (2) light absorption filter;    (3) color conversion light-emitting device, which has light emission portion and color conversion layer or color conversion filter; and    (4) photoelectric conversion device, which has photoelectric conversion element and color conversion filter.    DESCRIPTION OF DRAWING(S) - The drawings show the sectional view of color conversion light-emitting device.    Red filter layer (10R)    Color conversion layers (20B,20G,20R)    Black mask (30)    Light-emitting layer (40)    Support (50)